An ALMA and MagAO Study of the Substellar Companion GQ Lup B

Ya Lin Wu, Patrick D. Sheehan, Jared R. Males, Laird M. Close, Katie M. Morzinski, Johanna K. Teske, Asher Haug-Baltzell, Nirav Merchant, Eric Lyons

Research output: Research - peer-reviewArticle

  • 3 Citations

Abstract

Multi-wavelength observations provide a complementary view of the formation of young, directly imaged planet-mass companions. We report the ALMA 1.3 mm and Magellan adaptive optics Hα, i′, z′, and Y S observations of the GQ Lup system, a classical T Tauri star with a substellar companion at ∼110 au projected separation. We estimate the accretion rates for both components from the observed Hα fluxes. In our ∼0.″05 resolution ALMA map, we resolve GQ Lup A's disk in the dust continuum, but no signal is found from the companion. The disk is compact, with a radius of ∼22 au, a dust mass of ∼6 M , an inclination angle of ∼56°, and a very flat surface density profile indicative of a radial variation in dust grain sizes. No gaps or inner cavity are found in the disk, so there is unlikely a massive inner companion to scatter GQ Lup B outward. Thus, GQ Lup B might have formed in situ via disk fragmentation or prestellar core collapse. We also show that GQ Lup A's disk is misaligned with its spin axis, and possibly with GQ Lup B's orbit. Our analysis on the tidal truncation radius of GQ Lup A's disk suggests that GQ Lup B's orbit might have a low eccentricity.

LanguageEnglish (US)
Article number223
JournalAstrophysical Journal
Volume836
Issue number2
DOIs
StatePublished - Feb 20 2017

Fingerprint

dust
eccentricity
fragmentation
cavity
planet
grain size
accretion
wavelength
rate
analysis
young
in situ
orbits
radii
T Tauri stars
adaptive optics
inclination
planets
flat surfaces
continuums

Keywords

  • accretion, accretion disks
  • instrumentation: adaptive optics
  • planets and satellites: individual (GQ Lup B)
  • stars: individual (GQ Lup)
  • techniques: interferometric

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Wu, Y. L., Sheehan, P. D., Males, J. R., Close, L. M., Morzinski, K. M., Teske, J. K., ... Lyons, E. (2017). An ALMA and MagAO Study of the Substellar Companion GQ Lup B. Astrophysical Journal, 836(2), [223]. DOI: 10.3847/1538-4357/aa5b96

An ALMA and MagAO Study of the Substellar Companion GQ Lup B. / Wu, Ya Lin; Sheehan, Patrick D.; Males, Jared R.; Close, Laird M.; Morzinski, Katie M.; Teske, Johanna K.; Haug-Baltzell, Asher; Merchant, Nirav; Lyons, Eric.

In: Astrophysical Journal, Vol. 836, No. 2, 223, 20.02.2017.

Research output: Research - peer-reviewArticle

Wu, YL, Sheehan, PD, Males, JR, Close, LM, Morzinski, KM, Teske, JK, Haug-Baltzell, A, Merchant, N & Lyons, E 2017, 'An ALMA and MagAO Study of the Substellar Companion GQ Lup B' Astrophysical Journal, vol 836, no. 2, 223. DOI: 10.3847/1538-4357/aa5b96
Wu YL, Sheehan PD, Males JR, Close LM, Morzinski KM, Teske JK et al. An ALMA and MagAO Study of the Substellar Companion GQ Lup B. Astrophysical Journal. 2017 Feb 20;836(2). 223. Available from, DOI: 10.3847/1538-4357/aa5b96
Wu, Ya Lin ; Sheehan, Patrick D. ; Males, Jared R. ; Close, Laird M. ; Morzinski, Katie M. ; Teske, Johanna K. ; Haug-Baltzell, Asher ; Merchant, Nirav ; Lyons, Eric. / An ALMA and MagAO Study of the Substellar Companion GQ Lup B. In: Astrophysical Journal. 2017 ; Vol. 836, No. 2.
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