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Title: ACCRETION ONTO PLANETARY MASS COMPANIONS OF LOW-MASS YOUNG STARS

Measurements of accretion rates onto planetary mass objects may distinguish between different planet formation mechanisms, which predict different accretion histories. In this Letter, we use Hubble Space Telescope (HST)/WFC3 UVIS optical photometry to measure accretion rates onto three accreting objects, GSC 06214–00210 b, GQ Lup b, and DH Tau b, that are at the planet/brown dwarf boundary and are companions to solar mass stars. The excess optical emission in the excess accretion continuum yields mass accretion rates of 10{sup –9}-10{sup –11} M {sub ☉} yr{sup –1} for these three objects. Their accretion rates are an order of magnitude higher than expected from the correlation between mass and accretion rates measured from the UV excess, which is applicable if these wide planetary mass companions formed by protostellar core fragmentation. The high accretion rates and large separation from the central star demonstrate the presence of massive disks around these objects. Models for the formation and evolution of wide planetary mass companions should account for their large accretion rates. High ratios of Hα luminosity over accretion luminosity for objects with low accretion rates suggest that searches for Hα emission may be an efficient way to find accreting planets.
Authors:
;  [1] ;  [2] ;  [3] ;  [4]
  1. Kavli Institute for Astronomy and Astrophysics, Peking University, Yi He Yuan Lu 5, Haidian Qu, Beijing 100871 (China)
  2. Department of Astronomy, The University of Texas at Austin, Austin, TX 78712 (United States)
  3. Department of Physics and Astronomy, The University of Western Ontario, London, ON N6A 3K7 (Canada)
  4. Department of Physics and Astronomy, Hunter College, City University of New York, New York, NY 10065 (United States)
Publication Date:
OSTI Identifier:
22363946
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal Letters; Journal Volume: 783; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ACCRETION DISKS; CORRELATIONS; EMISSION; FRAGMENTATION; LUMINOSITY; MASS; PHOTOMETRY; PLANETS; PROTOPLANETS; SPACE; STAR ACCRETION; STARS; TELESCOPES