An Accurate Mass Determination for Kepler-1655b, a Moderately Irradiated World with a Significant Volatile Envelope

Raphaëlle D. Haywood, Andrew Vanderburg, Annelies Mortier, Helen A. C. Giles, Mercedes López-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, Stéphane Udry, François BouchyJohn A. Johnson, Michel Mayor, Giusi Micela, David Phillips, Giampaolo Piotto, Ken Rice, Dimitar Sasselov, Damien Ségransan, Chris Watson, Laura Affer, Aldo S. Bonomo, Lars A. Buchhave, David R. Ciardi, Aldo F. Fiorenzano, Avet Harutyunyan

Research output: Contribution to journalArticlepeer-review


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 Telescopio Nazionale Galileo/HARPS-N, enabling us to characterize the host star and determine an accurate mass for Kepler-1655b of 5.0{+/- }2.83.1 {M}\oplus 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
Pages (from-to)203
JournalAstronomical Journal
Issue number5
Publication statusPublished - 20 Apr 2018


  • stars: individual: Kepler-1655
  • KOI-280
  • KIC 4141376
  • 2MASS J19064546+3912428
  • planets and satellites: detection
  • planets and satellites: gaseous planets


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