Very Large Telescope observations of Gomez’s Hamburger: Insights into a young protoplanet candidate

Abstract : Planets are thought to form in the gas and dust disks around young stars. In particular, it has been proposed that giant planets can form through the gravitational instability of massive extended disks around intermediate-mass stars. However, we still lack direct observations to constrain this mechanism. We have spatially resolved the 8.6 and 11.2 μm emission of a massive protoplanetary disk seen edge on around an A star, Gomez’s Hamburger (GoHam), using VISIR at the Very Large Telescope. A compact region situated at a projected distance of 350 ± 50 AU south of the central star is found to have a reduced emission. This asymmetry is fully consistent with the presence of a cold density structure, or clump, identified in earlier CO observations, and we derive physical characteristics consistent with those observations: a mass of 0.8−11.4 Jupiter masses (for a dust-to-gas mass ratio of 0.01), a radius of about 102 astronomical units, and a local density of about 107 cm-3. Based on this evidence, we argue that this clump, which we call GoHam b, is a promising candidate for a young protoplanet formed by gravitational instability that might be representative of the precursors of massive planets observed around A stars, such as HR 8799 or Beta pictoris. More detailed studies at high angular resolution are needed to better constrain the physical properties of this object to confirm this proposal.
Document type :
Journal articles
Complete list of metadatas

Cited literature [16 references]  Display  Hide  Download

https://hal-cea.archives-ouvertes.fr/cea-01300583
Contributor : Edp Sciences <>
Submitted on : Monday, April 11, 2016 - 11:34:08 AM
Last modification on : Thursday, July 25, 2019 - 4:34:11 PM
Long-term archiving on : Tuesday, November 15, 2016 - 12:06:06 AM

File

aa26041-15.pdf
Publication funded by an institution

Identifiers

Citation

O. Berné, A. Fuente, E. Pantin, V. Bujarrabal, C. Baruteau, et al.. Very Large Telescope observations of Gomez’s Hamburger: Insights into a young protoplanet candidate. Astronomy and Astrophysics - A&A, EDP Sciences, 2015, 578, pp.L8. ⟨10.1051/0004-6361/201526041⟩. ⟨cea-01300583⟩

Share

Metrics

Record views

298

Files downloads

92