An accurate mass determination for Kepler-1655b, a moderately-irradiated world with a significant volatile envelope

Raphaelle D. Haywood*, Andrew Vanderburg, Annelies Mortier, Helen A. C. Giles, Mercedes Lopez-Morales, Eric D. Lopez, Luca Malavolta, David Charbonneau, Andrew Collier Cameron, Jeffrey L. Coughlin, Courtney D. Dressing, Chantanelle Nava, David W. Latham, Xavier Dumusque, Christophe Lovis, Emilio Molinari, Francesco Pepe, Alessandro Sozzetti, Stephane Udry, Francois BouchyJohn A. Johnson, Michel Mayor, Giusi Micela, David Phillips, Giampaolo Piotto, Ken Rice, Dimitar Sasselov, Damien Segransan, Chris Watson, Laura Affer, Aldo S. Bonomo, Lars A. Buchhave, David R. Ciardi, Aldo F. Fiorenzano, Avet Harutyunyan

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)
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Abstract

We present the confirmation of a small, moderately-irradiated (F= 155±7 F⊕) Neptune with a substantial gas envelope in a P=11.8728787±0.0000085-day orbit about a quiet, Sun-like G0V star Kepler-1655. Based on our analysis of the Kepler light curve, we determined Kepler-1655b’s radius to be 2.213±0.082 R⊕. We acquired 95 high-resolution spectra with TNG/HARPS-N, enabling us to characterize the host star and determine an accurate mass for Kepler-1655b of 5.0±^3.1_2.8 M⊕ via Gaussian-process regression. Our mass determination excludes an Earth-like composition with 98% confidence. Kepler-1655b falls on the upper edge of the evaporation valley, in the relatively sparsely occupied transition region between rocky and gas-rich planets. It is therefore part of a population of planets that we should actively seek to characterize further.
Original languageEnglish
Article number203
Number of pages19
JournalAstronomical Journal
Volume155
Issue number5
Early online date20 Apr 2018
DOIs
Publication statusPublished - May 2018

Keywords

  • Planets and satellites: detection
  • Planets and satellites: gaseous planets

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