Discovery of a transiting planet near the snow-line

D. M. Kipping, G. Torres, L. A. Buchhave, S. J. Kenyon, C. Henze, H. Isaacson, R. Kolbl, G. W. Marcy, S. T. Bryson, K. Stassun, F. Bastien

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

In most theories of planet formation, the snow-line represents a boundary between the emergence of the interior rocky planets and the exterior ice giants. The wide separation of the snow-line makes the discovery of transiting worlds challenging, yet transits would allow for detailed subsequent characterization. We present the discovery of Kepler-421b, a Uranus-sized exoplanet transiting a G9/K0 dwarf once every 704.2 days in a near-circular orbit. Using public Kepler photometry, we demonstrate that the two observed transits can be uniquely attributed to the 704.2 day period. Detailed light curve analysis with BLENDER validates the planetary nature of Kepler-421b to >4σ confidence. Kepler-421b receives the same insolation as a body at ~2 AU in the solar system, as well as a Uranian albedo, which would have an effective temperature of ~180 K. Using a time-dependent model for the protoplanetary disk, we estimate that Kepler-421b's present semi-major axis was beyond the snow-line after ~3 Myr, indicating that Kepler-421b may have formed at its observed location.

Original languageEnglish (US)
Article number25
JournalAstrophysical Journal
Volume795
Issue number1
DOIs
StatePublished - Nov 1 2014

Fingerprint

snow
planets
planet
transit
insolation
Uranus (planet)
Uranus
protoplanetary disks
circular orbits
extrasolar planets
albedo
solar system
light curve
photometry
confidence
ice
estimates
temperature

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Kipping, D. M., Torres, G., Buchhave, L. A., Kenyon, S. J., Henze, C., Isaacson, H., ... Bastien, F. (2014). Discovery of a transiting planet near the snow-line. Astrophysical Journal, 795(1), [25]. https://doi.org/10.1088/0004-637X/795/1/25
Kipping, D. M. ; Torres, G. ; Buchhave, L. A. ; Kenyon, S. J. ; Henze, C. ; Isaacson, H. ; Kolbl, R. ; Marcy, G. W. ; Bryson, S. T. ; Stassun, K. ; Bastien, F. / Discovery of a transiting planet near the snow-line. In: Astrophysical Journal. 2014 ; Vol. 795, No. 1.
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Kipping, DM, Torres, G, Buchhave, LA, Kenyon, SJ, Henze, C, Isaacson, H, Kolbl, R, Marcy, GW, Bryson, ST, Stassun, K & Bastien, F 2014, 'Discovery of a transiting planet near the snow-line', Astrophysical Journal, vol. 795, no. 1, 25. https://doi.org/10.1088/0004-637X/795/1/25

Discovery of a transiting planet near the snow-line. / Kipping, D. M.; Torres, G.; Buchhave, L. A.; Kenyon, S. J.; Henze, C.; Isaacson, H.; Kolbl, R.; Marcy, G. W.; Bryson, S. T.; Stassun, K.; Bastien, F.

In: Astrophysical Journal, Vol. 795, No. 1, 25, 01.11.2014.

Research output: Contribution to journalArticle

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Kipping DM, Torres G, Buchhave LA, Kenyon SJ, Henze C, Isaacson H et al. Discovery of a transiting planet near the snow-line. Astrophysical Journal. 2014 Nov 1;795(1). 25. https://doi.org/10.1088/0004-637X/795/1/25