FIrst-light lbt nulling interferometric observations

Warm exozodiacal dust resolved within a few Au of η Crv

D. Defrère, Philip M Hinz, A. J. Skemer, G. M. Kennedy, V. P. Bailey, W. F. Hoffmann, B. Mennesson, R. Millan-Gabet, W. C. Danchi, O. Absil, P. Arbo, C. Beichman, G. Brusa, G. Bryden, E. C. Downey, O. Durney, S. Esposito, A. Gaspar, P. Grenz, C. Haniff & 20 others J. M. Hill, J. Lebreton, J. M. Leisenring, J. R. Males, L. Marion, T. J. McMahon, M. Montoya, K. M. Morzinski, E. Pinna, A. Puglisi, George H. Rieke, A. Roberge, E. Serabyn, R. Sosa, K. Stapeldfeldt, K. Su, V. Vaitheeswaran, A. Vaz, A. J. Weinberger, M. C. Wyatt

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

We report on the first nulling interferometric observations with the Large Binocular Telescope Interferometer (LBTI), resolving the N′ band (9.81-12.41 μm) emission around the nearby main-sequence star η Crv (F2V, 1-2 Gyr). The measured source null depth amounts to 4.40% ± 0.35% over a field-of-view of 140 mas in radius (∼2.6 AU for the distance of η Crv) and shows no significant variation over 35° of sky rotation. This relatively low null is unexpected given the total disk to star flux ratio measured by the Spitzer Infrared Spectrograph (IRS; ∼23% across the N′ band), suggesting that a significant fraction of the dust lies within the central nulled response of the LBTI (79 mas or 1.4 AU). Modeling of the warm disk shows that it cannot resemble a scaled version of the solar zodiacal cloud unless it is almost perpendicular to the outer disk imaged by Herschel. It is more likely that the inner and outer disks are coplanar and the warm dust is located at a distance of 0.5-1.0 AU, significantly closer than previously predicted by models of the IRS spectrum (∼3 AU). The predicted disk sizes can be reconciled if the warm disk is not centrosymmetric, or if the dust particles are dominated by very small grains. Both possibilities hint that a recent collision has produced much of the dust. Finally, we discuss the implications for the presence of dust for the distance where the insolation is the same as Earth's (2.3 AU).

Original languageEnglish (US)
Article number42
JournalAstrophysical Journal
Volume799
Issue number1
DOIs
StatePublished - Jan 20 2015

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dust
Indian spacecraft
interferometer
interferometers
telescopes
insolation
field of view
main sequence stars
collision
spectrographs
sky
stars
collisions
radii
modeling

Keywords

  • circumstellar matter
  • infrared: planetary systems
  • infrared: stars
  • instrumentation: interferometers
  • stars: individual (η Crv)

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

FIrst-light lbt nulling interferometric observations : Warm exozodiacal dust resolved within a few Au of η Crv. / Defrère, D.; Hinz, Philip M; Skemer, A. J.; Kennedy, G. M.; Bailey, V. P.; Hoffmann, W. F.; Mennesson, B.; Millan-Gabet, R.; Danchi, W. C.; Absil, O.; Arbo, P.; Beichman, C.; Brusa, G.; Bryden, G.; Downey, E. C.; Durney, O.; Esposito, S.; Gaspar, A.; Grenz, P.; Haniff, C.; Hill, J. M.; Lebreton, J.; Leisenring, J. M.; Males, J. R.; Marion, L.; McMahon, T. J.; Montoya, M.; Morzinski, K. M.; Pinna, E.; Puglisi, A.; Rieke, George H.; Roberge, A.; Serabyn, E.; Sosa, R.; Stapeldfeldt, K.; Su, K.; Vaitheeswaran, V.; Vaz, A.; Weinberger, A. J.; Wyatt, M. C.

In: Astrophysical Journal, Vol. 799, No. 1, 42, 20.01.2015.

Research output: Contribution to journalArticle

Defrère, D, Hinz, PM, Skemer, AJ, Kennedy, GM, Bailey, VP, Hoffmann, WF, Mennesson, B, Millan-Gabet, R, Danchi, WC, Absil, O, Arbo, P, Beichman, C, Brusa, G, Bryden, G, Downey, EC, Durney, O, Esposito, S, Gaspar, A, Grenz, P, Haniff, C, Hill, JM, Lebreton, J, Leisenring, JM, Males, JR, Marion, L, McMahon, TJ, Montoya, M, Morzinski, KM, Pinna, E, Puglisi, A, Rieke, GH, Roberge, A, Serabyn, E, Sosa, R, Stapeldfeldt, K, Su, K, Vaitheeswaran, V, Vaz, A, Weinberger, AJ & Wyatt, MC 2015, 'FIrst-light lbt nulling interferometric observations: Warm exozodiacal dust resolved within a few Au of η Crv', Astrophysical Journal, vol. 799, no. 1, 42. https://doi.org/10.1088/0004-637X/799/1/42
Defrère, D. ; Hinz, Philip M ; Skemer, A. J. ; Kennedy, G. M. ; Bailey, V. P. ; Hoffmann, W. F. ; Mennesson, B. ; Millan-Gabet, R. ; Danchi, W. C. ; Absil, O. ; Arbo, P. ; Beichman, C. ; Brusa, G. ; Bryden, G. ; Downey, E. C. ; Durney, O. ; Esposito, S. ; Gaspar, A. ; Grenz, P. ; Haniff, C. ; Hill, J. M. ; Lebreton, J. ; Leisenring, J. M. ; Males, J. R. ; Marion, L. ; McMahon, T. J. ; Montoya, M. ; Morzinski, K. M. ; Pinna, E. ; Puglisi, A. ; Rieke, George H. ; Roberge, A. ; Serabyn, E. ; Sosa, R. ; Stapeldfeldt, K. ; Su, K. ; Vaitheeswaran, V. ; Vaz, A. ; Weinberger, A. J. ; Wyatt, M. C. / FIrst-light lbt nulling interferometric observations : Warm exozodiacal dust resolved within a few Au of η Crv. In: Astrophysical Journal. 2015 ; Vol. 799, No. 1.
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abstract = "We report on the first nulling interferometric observations with the Large Binocular Telescope Interferometer (LBTI), resolving the N′ band (9.81-12.41 μm) emission around the nearby main-sequence star η Crv (F2V, 1-2 Gyr). The measured source null depth amounts to 4.40{\%} ± 0.35{\%} over a field-of-view of 140 mas in radius (∼2.6 AU for the distance of η Crv) and shows no significant variation over 35° of sky rotation. This relatively low null is unexpected given the total disk to star flux ratio measured by the Spitzer Infrared Spectrograph (IRS; ∼23{\%} across the N′ band), suggesting that a significant fraction of the dust lies within the central nulled response of the LBTI (79 mas or 1.4 AU). Modeling of the warm disk shows that it cannot resemble a scaled version of the solar zodiacal cloud unless it is almost perpendicular to the outer disk imaged by Herschel. It is more likely that the inner and outer disks are coplanar and the warm dust is located at a distance of 0.5-1.0 AU, significantly closer than previously predicted by models of the IRS spectrum (∼3 AU). The predicted disk sizes can be reconciled if the warm disk is not centrosymmetric, or if the dust particles are dominated by very small grains. Both possibilities hint that a recent collision has produced much of the dust. Finally, we discuss the implications for the presence of dust for the distance where the insolation is the same as Earth's (2.3 AU).",
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T2 - Warm exozodiacal dust resolved within a few Au of η Crv

AU - Defrère, D.

AU - Hinz, Philip M

AU - Skemer, A. J.

AU - Kennedy, G. M.

AU - Bailey, V. P.

AU - Hoffmann, W. F.

AU - Mennesson, B.

AU - Millan-Gabet, R.

AU - Danchi, W. C.

AU - Absil, O.

AU - Arbo, P.

AU - Beichman, C.

AU - Brusa, G.

AU - Bryden, G.

AU - Downey, E. C.

AU - Durney, O.

AU - Esposito, S.

AU - Gaspar, A.

AU - Grenz, P.

AU - Haniff, C.

AU - Hill, J. M.

AU - Lebreton, J.

AU - Leisenring, J. M.

AU - Males, J. R.

AU - Marion, L.

AU - McMahon, T. J.

AU - Montoya, M.

AU - Morzinski, K. M.

AU - Pinna, E.

AU - Puglisi, A.

AU - Rieke, George H.

AU - Roberge, A.

AU - Serabyn, E.

AU - Sosa, R.

AU - Stapeldfeldt, K.

AU - Su, K.

AU - Vaitheeswaran, V.

AU - Vaz, A.

AU - Weinberger, A. J.

AU - Wyatt, M. C.

PY - 2015/1/20

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N2 - We report on the first nulling interferometric observations with the Large Binocular Telescope Interferometer (LBTI), resolving the N′ band (9.81-12.41 μm) emission around the nearby main-sequence star η Crv (F2V, 1-2 Gyr). The measured source null depth amounts to 4.40% ± 0.35% over a field-of-view of 140 mas in radius (∼2.6 AU for the distance of η Crv) and shows no significant variation over 35° of sky rotation. This relatively low null is unexpected given the total disk to star flux ratio measured by the Spitzer Infrared Spectrograph (IRS; ∼23% across the N′ band), suggesting that a significant fraction of the dust lies within the central nulled response of the LBTI (79 mas or 1.4 AU). Modeling of the warm disk shows that it cannot resemble a scaled version of the solar zodiacal cloud unless it is almost perpendicular to the outer disk imaged by Herschel. It is more likely that the inner and outer disks are coplanar and the warm dust is located at a distance of 0.5-1.0 AU, significantly closer than previously predicted by models of the IRS spectrum (∼3 AU). The predicted disk sizes can be reconciled if the warm disk is not centrosymmetric, or if the dust particles are dominated by very small grains. Both possibilities hint that a recent collision has produced much of the dust. Finally, we discuss the implications for the presence of dust for the distance where the insolation is the same as Earth's (2.3 AU).

AB - We report on the first nulling interferometric observations with the Large Binocular Telescope Interferometer (LBTI), resolving the N′ band (9.81-12.41 μm) emission around the nearby main-sequence star η Crv (F2V, 1-2 Gyr). The measured source null depth amounts to 4.40% ± 0.35% over a field-of-view of 140 mas in radius (∼2.6 AU for the distance of η Crv) and shows no significant variation over 35° of sky rotation. This relatively low null is unexpected given the total disk to star flux ratio measured by the Spitzer Infrared Spectrograph (IRS; ∼23% across the N′ band), suggesting that a significant fraction of the dust lies within the central nulled response of the LBTI (79 mas or 1.4 AU). Modeling of the warm disk shows that it cannot resemble a scaled version of the solar zodiacal cloud unless it is almost perpendicular to the outer disk imaged by Herschel. It is more likely that the inner and outer disks are coplanar and the warm dust is located at a distance of 0.5-1.0 AU, significantly closer than previously predicted by models of the IRS spectrum (∼3 AU). The predicted disk sizes can be reconciled if the warm disk is not centrosymmetric, or if the dust particles are dominated by very small grains. Both possibilities hint that a recent collision has produced much of the dust. Finally, we discuss the implications for the presence of dust for the distance where the insolation is the same as Earth's (2.3 AU).

KW - circumstellar matter

KW - infrared: planetary systems

KW - infrared: stars

KW - instrumentation: interferometers

KW - stars: individual (η Crv)

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