Evidence for Dynamically Driven Formation of the GW170817 Neutron Star Binary in NGC 4993

A. Palmese, W. Hartley, F. Tarsitano, C. Conselice, O. Lahav, S. Allam, J. Annis, H. Lin, M. Soares-Santos, D. Tucker, D. Brout, M. Banerji, K. Bechtol, H. T. Diehl, A. Fruchter, J. Garcia-Bellido, K. Herner, A. J. Levan, T. S. Li, C. LidmanK. Misra, M. Sako, D. Scolnic, M. Smith, T. M.C. Abbott, F. B. Abdalla, A. Benoit-Lévy, E. Bertin, D. Brooks, E. Buckley-Geer, A. Carnero Rosell, M. Carrasco Kind, J. Carretero, F. J. Castander, C. E. Cunha, C. B. D'Andrea, L. N. Da Costa, C. Davis, D. L. Depoy, S. Desai, J. P. Dietrich, P. Doel, A. Drlica-Wagner, T. F. Eifler, A. E. Evrard, B. Flaugher, P. Fosalba, J. Frieman, E. Gaztanaga, D. W. Gerdes, T. Giannantonio, D. Gruen, R. A. Gruendl, J. Gschwend, G. Gutierrez, K. Honscheid, B. Jain, D. J. James, T. Jeltema, M. W.G. Johnson, M. D. Johnson, E. Krause, R. Kron, K. Kuehn, S. Kuhlmann, N. Kuropatkin, M. Lima, M. A.G. Maia, M. March, J. L. Marshall, R. G. McMahon, F. Menanteau, C. J. Miller, R. Miquel, E. Neilsen, R. L.C. Ogando, A. A. Plazas, K. Reil, A. K. Romer, E. Sanchez, R. Schindler, R. C. Smith, F. Sobreira, E. Suchyta, M. E.C. Swanson, G. Tarle, D. Thomas, R. C. Thomas, A. R. Walker, J. Weller, Y. Zhang, J. Zuntz

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

We present a study of NGC 4993, the host galaxy of the GW170817 gravitational-wave event, the GRB 170817A short gamma-ray burst (sGRB), and the AT 2017gfo kilonova. We use Dark Energy Camera imaging, AAT spectra, and publicly available data, relating our findings to binary neutron star (BNS) formation scenarios and merger delay timescales. NGC 4993 is a nearby early-type galaxy, with an i-band Sérsic index n = 4.0 and low asymmetry (A = 0.04 ±0.01). These properties are unusual for sGRB hosts. However, NGC 4993 presents shell-like structures and dust lanes indicative of a recent galaxy merger, with the optical transient located close to a shell. We constrain the star formation history (SFH) of the galaxy assuming that the galaxy merger produced a star formation burst, but find little to no ongoing star formation in either spatially resolved broadband SED or spectral fitting. We use the best-fit SFH to estimate the BNS merger rate in this type of galaxy, as . If star formation is the only considered BNS formation scenario, the expected number of BNS mergers from early-type galaxies detectable with LIGO during its first two observing seasons is , as opposed to ∼0.5 from all galaxy types. Hypothesizing that the binary formed due to dynamical interactions during the galaxy merger, the subsequent time elapsed can constrain the delay time of the BNS coalescence. By using velocity dispersion estimates and the position of the shells, we find that the galaxy merger occurred t mer ≲ 200 Myr prior to the BNS coalescence.

Original languageEnglish (US)
Article numberL34
JournalAstrophysical Journal Letters
Volume849
Issue number2
DOIs
StatePublished - Nov 10 2017
Externally publishedYes

Fingerprint

merger
neutron stars
galaxies
binary stars
star formation
shell
coalescence
gamma ray bursts
coalescing
history
histories
LIGO (observatory)
asymmetry
estimates
dark energy
dust
timescale
gravitational waves
bursts
time lag

Keywords

  • galaxies: evolution
  • galaxies: individual (NGC 4993)
  • galaxies: structure
  • gravitational waves

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Palmese, A., Hartley, W., Tarsitano, F., Conselice, C., Lahav, O., Allam, S., ... Zuntz, J. (2017). Evidence for Dynamically Driven Formation of the GW170817 Neutron Star Binary in NGC 4993. Astrophysical Journal Letters, 849(2), [L34]. https://doi.org/10.3847/2041-8213/aa9660

Evidence for Dynamically Driven Formation of the GW170817 Neutron Star Binary in NGC 4993. / Palmese, A.; Hartley, W.; Tarsitano, F.; Conselice, C.; Lahav, O.; Allam, S.; Annis, J.; Lin, H.; Soares-Santos, M.; Tucker, D.; Brout, D.; Banerji, M.; Bechtol, K.; Diehl, H. T.; Fruchter, A.; Garcia-Bellido, J.; Herner, K.; Levan, A. J.; Li, T. S.; Lidman, C.; Misra, K.; Sako, M.; Scolnic, D.; Smith, M.; Abbott, T. M.C.; Abdalla, F. B.; Benoit-Lévy, A.; Bertin, E.; Brooks, D.; Buckley-Geer, E.; Rosell, A. Carnero; Kind, M. Carrasco; Carretero, J.; Castander, F. J.; Cunha, C. E.; D'Andrea, C. B.; Da Costa, L. N.; Davis, C.; Depoy, D. L.; Desai, S.; Dietrich, J. P.; Doel, P.; Drlica-Wagner, A.; Eifler, T. F.; Evrard, A. E.; Flaugher, B.; Fosalba, P.; Frieman, J.; Gaztanaga, E.; Gerdes, D. W.; Giannantonio, T.; Gruen, D.; Gruendl, R. A.; Gschwend, J.; Gutierrez, G.; Honscheid, K.; Jain, B.; James, D. J.; Jeltema, T.; Johnson, M. W.G.; Johnson, M. D.; Krause, E.; Kron, R.; Kuehn, K.; Kuhlmann, S.; Kuropatkin, N.; Lima, M.; Maia, M. A.G.; March, M.; Marshall, J. L.; McMahon, R. G.; Menanteau, F.; Miller, C. J.; Miquel, R.; Neilsen, E.; Ogando, R. L.C.; Plazas, A. A.; Reil, K.; Romer, A. K.; Sanchez, E.; Schindler, R.; Smith, R. C.; Sobreira, F.; Suchyta, E.; Swanson, M. E.C.; Tarle, G.; Thomas, D.; Thomas, R. C.; Walker, A. R.; Weller, J.; Zhang, Y.; Zuntz, J.

In: Astrophysical Journal Letters, Vol. 849, No. 2, L34, 10.11.2017.

Research output: Contribution to journalArticle

Palmese, A, Hartley, W, Tarsitano, F, Conselice, C, Lahav, O, Allam, S, Annis, J, Lin, H, Soares-Santos, M, Tucker, D, Brout, D, Banerji, M, Bechtol, K, Diehl, HT, Fruchter, A, Garcia-Bellido, J, Herner, K, Levan, AJ, Li, TS, Lidman, C, Misra, K, Sako, M, Scolnic, D, Smith, M, Abbott, TMC, Abdalla, FB, Benoit-Lévy, A, Bertin, E, Brooks, D, Buckley-Geer, E, Rosell, AC, Kind, MC, Carretero, J, Castander, FJ, Cunha, CE, D'Andrea, CB, Da Costa, LN, Davis, C, Depoy, DL, Desai, S, Dietrich, JP, Doel, P, Drlica-Wagner, A, Eifler, TF, Evrard, AE, Flaugher, B, Fosalba, P, Frieman, J, Gaztanaga, E, Gerdes, DW, Giannantonio, T, Gruen, D, Gruendl, RA, Gschwend, J, Gutierrez, G, Honscheid, K, Jain, B, James, DJ, Jeltema, T, Johnson, MWG, Johnson, MD, Krause, E, Kron, R, Kuehn, K, Kuhlmann, S, Kuropatkin, N, Lima, M, Maia, MAG, March, M, Marshall, JL, McMahon, RG, Menanteau, F, Miller, CJ, Miquel, R, Neilsen, E, Ogando, RLC, Plazas, AA, Reil, K, Romer, AK, Sanchez, E, Schindler, R, Smith, RC, Sobreira, F, Suchyta, E, Swanson, MEC, Tarle, G, Thomas, D, Thomas, RC, Walker, AR, Weller, J, Zhang, Y & Zuntz, J 2017, 'Evidence for Dynamically Driven Formation of the GW170817 Neutron Star Binary in NGC 4993', Astrophysical Journal Letters, vol. 849, no. 2, L34. https://doi.org/10.3847/2041-8213/aa9660
Palmese, A. ; Hartley, W. ; Tarsitano, F. ; Conselice, C. ; Lahav, O. ; Allam, S. ; Annis, J. ; Lin, H. ; Soares-Santos, M. ; Tucker, D. ; Brout, D. ; Banerji, M. ; Bechtol, K. ; Diehl, H. T. ; Fruchter, A. ; Garcia-Bellido, J. ; Herner, K. ; Levan, A. J. ; Li, T. S. ; Lidman, C. ; Misra, K. ; Sako, M. ; Scolnic, D. ; Smith, M. ; Abbott, T. M.C. ; Abdalla, F. B. ; Benoit-Lévy, A. ; Bertin, E. ; Brooks, D. ; Buckley-Geer, E. ; Rosell, A. Carnero ; Kind, M. Carrasco ; Carretero, J. ; Castander, F. J. ; Cunha, C. E. ; D'Andrea, C. B. ; Da Costa, L. N. ; Davis, C. ; Depoy, D. L. ; Desai, S. ; Dietrich, J. P. ; Doel, P. ; Drlica-Wagner, A. ; Eifler, T. F. ; Evrard, A. E. ; Flaugher, B. ; Fosalba, P. ; Frieman, J. ; Gaztanaga, E. ; Gerdes, D. W. ; Giannantonio, T. ; Gruen, D. ; Gruendl, R. A. ; Gschwend, J. ; Gutierrez, G. ; Honscheid, K. ; Jain, B. ; James, D. J. ; Jeltema, T. ; Johnson, M. W.G. ; Johnson, M. D. ; Krause, E. ; Kron, R. ; Kuehn, K. ; Kuhlmann, S. ; Kuropatkin, N. ; Lima, M. ; Maia, M. A.G. ; March, M. ; Marshall, J. L. ; McMahon, R. G. ; Menanteau, F. ; Miller, C. J. ; Miquel, R. ; Neilsen, E. ; Ogando, R. L.C. ; Plazas, A. A. ; Reil, K. ; Romer, A. K. ; Sanchez, E. ; Schindler, R. ; Smith, R. C. ; Sobreira, F. ; Suchyta, E. ; Swanson, M. E.C. ; Tarle, G. ; Thomas, D. ; Thomas, R. C. ; Walker, A. R. ; Weller, J. ; Zhang, Y. ; Zuntz, J. / Evidence for Dynamically Driven Formation of the GW170817 Neutron Star Binary in NGC 4993. In: Astrophysical Journal Letters. 2017 ; Vol. 849, No. 2.
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title = "Evidence for Dynamically Driven Formation of the GW170817 Neutron Star Binary in NGC 4993",
abstract = "We present a study of NGC 4993, the host galaxy of the GW170817 gravitational-wave event, the GRB 170817A short gamma-ray burst (sGRB), and the AT 2017gfo kilonova. We use Dark Energy Camera imaging, AAT spectra, and publicly available data, relating our findings to binary neutron star (BNS) formation scenarios and merger delay timescales. NGC 4993 is a nearby early-type galaxy, with an i-band S{\'e}rsic index n = 4.0 and low asymmetry (A = 0.04 ±0.01). These properties are unusual for sGRB hosts. However, NGC 4993 presents shell-like structures and dust lanes indicative of a recent galaxy merger, with the optical transient located close to a shell. We constrain the star formation history (SFH) of the galaxy assuming that the galaxy merger produced a star formation burst, but find little to no ongoing star formation in either spatially resolved broadband SED or spectral fitting. We use the best-fit SFH to estimate the BNS merger rate in this type of galaxy, as . If star formation is the only considered BNS formation scenario, the expected number of BNS mergers from early-type galaxies detectable with LIGO during its first two observing seasons is , as opposed to ∼0.5 from all galaxy types. Hypothesizing that the binary formed due to dynamical interactions during the galaxy merger, the subsequent time elapsed can constrain the delay time of the BNS coalescence. By using velocity dispersion estimates and the position of the shells, we find that the galaxy merger occurred t mer ≲ 200 Myr prior to the BNS coalescence.",
keywords = "galaxies: evolution, galaxies: individual (NGC 4993), galaxies: structure, gravitational waves",
author = "A. Palmese and W. Hartley and F. Tarsitano and C. Conselice and O. Lahav and S. Allam and J. Annis and H. Lin and M. Soares-Santos and D. Tucker and D. Brout and M. Banerji and K. Bechtol and Diehl, {H. T.} and A. Fruchter and J. Garcia-Bellido and K. Herner and Levan, {A. J.} and Li, {T. S.} and C. Lidman and K. Misra and M. Sako and D. Scolnic and M. Smith and Abbott, {T. M.C.} and Abdalla, {F. B.} and A. Benoit-L{\'e}vy and E. Bertin and D. Brooks and E. Buckley-Geer and Rosell, {A. Carnero} and Kind, {M. Carrasco} and J. Carretero and Castander, {F. J.} and Cunha, {C. E.} and D'Andrea, {C. B.} and {Da Costa}, {L. N.} and C. Davis and Depoy, {D. L.} and S. Desai and Dietrich, {J. P.} and P. Doel and A. Drlica-Wagner and Eifler, {T. F.} and Evrard, {A. E.} and B. Flaugher and P. Fosalba and J. Frieman and E. Gaztanaga and Gerdes, {D. W.} and T. Giannantonio and D. Gruen and Gruendl, {R. A.} and J. Gschwend and G. Gutierrez and K. Honscheid and B. Jain and James, {D. J.} and T. Jeltema and Johnson, {M. W.G.} and Johnson, {M. D.} and E. Krause and R. Kron and K. Kuehn and S. Kuhlmann and N. Kuropatkin and M. Lima and Maia, {M. A.G.} and M. March and Marshall, {J. L.} and McMahon, {R. G.} and F. Menanteau and Miller, {C. J.} and R. Miquel and E. Neilsen and Ogando, {R. L.C.} and Plazas, {A. A.} and K. Reil and Romer, {A. K.} and E. Sanchez and R. Schindler and Smith, {R. C.} and F. Sobreira and E. Suchyta and Swanson, {M. E.C.} and G. Tarle and D. Thomas and Thomas, {R. C.} and Walker, {A. R.} and J. Weller and Y. Zhang and J. Zuntz",
year = "2017",
month = "11",
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language = "English (US)",
volume = "849",
journal = "Astrophysical Journal Letters",
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TY - JOUR

T1 - Evidence for Dynamically Driven Formation of the GW170817 Neutron Star Binary in NGC 4993

AU - Palmese, A.

AU - Hartley, W.

AU - Tarsitano, F.

AU - Conselice, C.

AU - Lahav, O.

AU - Allam, S.

AU - Annis, J.

AU - Lin, H.

AU - Soares-Santos, M.

AU - Tucker, D.

AU - Brout, D.

AU - Banerji, M.

AU - Bechtol, K.

AU - Diehl, H. T.

AU - Fruchter, A.

AU - Garcia-Bellido, J.

AU - Herner, K.

AU - Levan, A. J.

AU - Li, T. S.

AU - Lidman, C.

AU - Misra, K.

AU - Sako, M.

AU - Scolnic, D.

AU - Smith, M.

AU - Abbott, T. M.C.

AU - Abdalla, F. B.

AU - Benoit-Lévy, A.

AU - Bertin, E.

AU - Brooks, D.

AU - Buckley-Geer, E.

AU - Rosell, A. Carnero

AU - Kind, M. Carrasco

AU - Carretero, J.

AU - Castander, F. J.

AU - Cunha, C. E.

AU - D'Andrea, C. B.

AU - Da Costa, L. N.

AU - Davis, C.

AU - Depoy, D. L.

AU - Desai, S.

AU - Dietrich, J. P.

AU - Doel, P.

AU - Drlica-Wagner, A.

AU - Eifler, T. F.

AU - Evrard, A. E.

AU - Flaugher, B.

AU - Fosalba, P.

AU - Frieman, J.

AU - Gaztanaga, E.

AU - Gerdes, D. W.

AU - Giannantonio, T.

AU - Gruen, D.

AU - Gruendl, R. A.

AU - Gschwend, J.

AU - Gutierrez, G.

AU - Honscheid, K.

AU - Jain, B.

AU - James, D. J.

AU - Jeltema, T.

AU - Johnson, M. W.G.

AU - Johnson, M. D.

AU - Krause, E.

AU - Kron, R.

AU - Kuehn, K.

AU - Kuhlmann, S.

AU - Kuropatkin, N.

AU - Lima, M.

AU - Maia, M. A.G.

AU - March, M.

AU - Marshall, J. L.

AU - McMahon, R. G.

AU - Menanteau, F.

AU - Miller, C. J.

AU - Miquel, R.

AU - Neilsen, E.

AU - Ogando, R. L.C.

AU - Plazas, A. A.

AU - Reil, K.

AU - Romer, A. K.

AU - Sanchez, E.

AU - Schindler, R.

AU - Smith, R. C.

AU - Sobreira, F.

AU - Suchyta, E.

AU - Swanson, M. E.C.

AU - Tarle, G.

AU - Thomas, D.

AU - Thomas, R. C.

AU - Walker, A. R.

AU - Weller, J.

AU - Zhang, Y.

AU - Zuntz, J.

PY - 2017/11/10

Y1 - 2017/11/10

N2 - We present a study of NGC 4993, the host galaxy of the GW170817 gravitational-wave event, the GRB 170817A short gamma-ray burst (sGRB), and the AT 2017gfo kilonova. We use Dark Energy Camera imaging, AAT spectra, and publicly available data, relating our findings to binary neutron star (BNS) formation scenarios and merger delay timescales. NGC 4993 is a nearby early-type galaxy, with an i-band Sérsic index n = 4.0 and low asymmetry (A = 0.04 ±0.01). These properties are unusual for sGRB hosts. However, NGC 4993 presents shell-like structures and dust lanes indicative of a recent galaxy merger, with the optical transient located close to a shell. We constrain the star formation history (SFH) of the galaxy assuming that the galaxy merger produced a star formation burst, but find little to no ongoing star formation in either spatially resolved broadband SED or spectral fitting. We use the best-fit SFH to estimate the BNS merger rate in this type of galaxy, as . If star formation is the only considered BNS formation scenario, the expected number of BNS mergers from early-type galaxies detectable with LIGO during its first two observing seasons is , as opposed to ∼0.5 from all galaxy types. Hypothesizing that the binary formed due to dynamical interactions during the galaxy merger, the subsequent time elapsed can constrain the delay time of the BNS coalescence. By using velocity dispersion estimates and the position of the shells, we find that the galaxy merger occurred t mer ≲ 200 Myr prior to the BNS coalescence.

AB - We present a study of NGC 4993, the host galaxy of the GW170817 gravitational-wave event, the GRB 170817A short gamma-ray burst (sGRB), and the AT 2017gfo kilonova. We use Dark Energy Camera imaging, AAT spectra, and publicly available data, relating our findings to binary neutron star (BNS) formation scenarios and merger delay timescales. NGC 4993 is a nearby early-type galaxy, with an i-band Sérsic index n = 4.0 and low asymmetry (A = 0.04 ±0.01). These properties are unusual for sGRB hosts. However, NGC 4993 presents shell-like structures and dust lanes indicative of a recent galaxy merger, with the optical transient located close to a shell. We constrain the star formation history (SFH) of the galaxy assuming that the galaxy merger produced a star formation burst, but find little to no ongoing star formation in either spatially resolved broadband SED or spectral fitting. We use the best-fit SFH to estimate the BNS merger rate in this type of galaxy, as . If star formation is the only considered BNS formation scenario, the expected number of BNS mergers from early-type galaxies detectable with LIGO during its first two observing seasons is , as opposed to ∼0.5 from all galaxy types. Hypothesizing that the binary formed due to dynamical interactions during the galaxy merger, the subsequent time elapsed can constrain the delay time of the BNS coalescence. By using velocity dispersion estimates and the position of the shells, we find that the galaxy merger occurred t mer ≲ 200 Myr prior to the BNS coalescence.

KW - galaxies: evolution

KW - galaxies: individual (NGC 4993)

KW - galaxies: structure

KW - gravitational waves

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UR - http://www.scopus.com/inward/citedby.url?scp=85034425963&partnerID=8YFLogxK

U2 - 10.3847/2041-8213/aa9660

DO - 10.3847/2041-8213/aa9660

M3 - Article

AN - SCOPUS:85034425963

VL - 849

JO - Astrophysical Journal Letters

JF - Astrophysical Journal Letters

SN - 2041-8205

IS - 2

M1 - L34

ER -