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

Research output: Contribution to journalArticle

  • Raphaëlle D. Haywood
  • Andrew Vanderburg
  • Annelies Mortier
  • Helen A. C. Giles
  • Mercedes López-Morales
  • 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 Bouchy
  • John A. Johnson
  • Michel Mayor
  • Giusi Micela
  • David Phillips
  • Giampaolo Piotto
  • Dimitar Sasselov
  • Damien Ségransan
  • Chris Watson
  • Laura Affer
  • Aldo S. Bonomo
  • Lars A. Buchhave
  • David R. Ciardi
  • Aldo F. Fiorenzano
  • Avet Harutyunyan

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Original languageEnglish
Pages (from-to)203
JournalAstronomical Journal
Issue number5
Publication statusPublished - 20 Apr 2018


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.

    Research areas

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

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