Giant Outer Transiting Exoplanet Mass (GOT 'EM) Survey. I. Confirmation of an Eccentric, Cool Jupiter With an Interior Earth-sized Planet Orbiting Kepler-1514*

Paul A. Dalba, Stephen R. Kane, Howard Isaacson, Steven Giacalone, Andrew W. Howard, Joseph E. Rodriguez, Andrew Vanderburg, Jason D. Eastman, Adam L. Kraus, Trent J. Dupuy, Lauren M. Weiss, Edward W. Schwieterman

Research output: Contribution to journalArticlepeer-review

Abstract

Despite the severe bias of the transit method of exoplanet discovery toward short orbital periods, a modest sample of transiting exoplanets with orbital periods greater than 100 days is known. Long-term radial velocity (RV) surveys are pivotal to confirming these signals and generating a set of planetary masses and densities for planets receiving moderate to low irradiation from their host stars. Here we conduct RV observations of Kepler-1514 from the Keck I telescope using the High Resolution Echelle Spectrometer. From these data, we measure the mass of the statistically validated giant (1.108 +/- 0.023 R-J) exoplanet Kepler-1514 b with a 218-day orbital period as 5.28 +/- 0.22M(J). The bulk density of this cool (similar to 390 K) giant planet is 4.82(-0.25)(-0.26)g cm(-3), consistent with a core supported by electron degeneracy pressure. We also infer an orbital eccentricity of 0.401(-0.014)(+0.013) from the RV and transit observations, which is consistent with planet-planet scattering and disk cavity migration models. The Kepler-1514 system contains an Earth-size, Kepler Object of Interest on a 10.5-day orbit that we statistically validate against false-positive scenarios, including those involving a neighboring star. The combination of the brightness (V = 11.8) of the host star and the long period, low irradiation, and high density of Kepler-1514 b places this system among a rare group of known exoplanetary systems and as one that is amenable to continued study.
Original languageEnglish
Article number103
Pages (from-to)1-13
Number of pages13
JournalAstronomical Journal
Volume161
Issue number3
Early online date4 Feb 2021
DOIs
Publication statusPublished - 1 Mar 2021

Keywords

  • astro-ph.EP

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