Kepler-15b: a hot Jupiter enriched in heavy elements and the first Kepler mission planet confirmed with the Hobby-Eberly Telescope

Endl, Michael and MacQueen, Phillip J. and Cochran, William D. and Brugamyer, Erik J. and Buchhave, Lars A. and Rowe, Jason and Lucas, Phillip and Isaacson, Howard and Bryson, Steve and Howell, Steve B. and Fortney, Jonathan J. and Hansen, Terese and Borucki, William J. and Caldwell, Douglas and Christiansen, Jessie L. and Ciardi, David R. and Demory, Brice Olivier and Everett, Mark and Ford, Eric B. and Haas, Michael R. and Holman, Matthew J. and Horch, Elliott and Jenkins, Jon M. and Koch, David J. and Lissauer, Jack J. and MacHalek, Pavel and Still, Martin and Welsh, William F. and Sanderfer, Dwight T. and Seader, Shawn E. and Smith, Jeffrey C. and Thompson, Susan E. and Twicken, Joseph D. (2011) Kepler-15b: a hot Jupiter enriched in heavy elements and the first Kepler mission planet confirmed with the Hobby-Eberly Telescope. Astrophysical Journal, Supplement Series, 197 (1). pp. 13-23. ISSN 0067-0049

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We report the discovery of Kepler-15b (KOI-128), a new transiting exoplanet detected by NASA's Kepler mission. The transit signal with a period of 4.94days was detected in the quarter 1 (Q1) Kepler photometry. For the first time, we have used the High Resolution Spectrograph (HRS) at the Hobby-Eberly Telescope (HET) to determine the mass of a Kepler planet via precise radial velocity (RV) measurements. The 24 HET/HRS RVs and 6 additional measurements from the Fibre-fed chelle Spectrograph spectrograph at the Nordic Optical Telescope reveal a Doppler signal with the same period and phase as the transit ephemeris. We used one HET/HRS spectrum of Kepler-15 taken without the iodine cell to determine accurate stellar parameters. The host star is a metal-rich ([Fe/H]= 0.36 ± 0.07) G-type main-sequence star with Teff = 5515 ± 124 K. The semi-amplitude K of the RV orbit is 78.7+8.5 -9.5ms-1, which yields a planet mass of 0.66 ± 0.1 M Jup. The planet has a radius of 0.96 ± 0.06R Jup and a mean bulk density of 0.9 ± 0.2 gcm-3. The radius of Kepler-15b is smaller than the majority of transiting planets with similar mass and irradiation level. This suggests that the planet is more enriched in heavy elements than most other transiting giant planets. For Kepler-15b we estimate a heavy element mass of 30-40 M ⊕.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Access to published version in accordance with the copyright policy of the publisher.
Faculty/School / Institute/Centre: No Faculty
Faculty/School / Institute/Centre: No Faculty
Date Deposited: 16 Jun 2017 07:00
Last Modified: 27 Jun 2017 01:18
Uncontrolled Keywords: planetary systems; stars; Kepler-15; KOI-128; KIC 11359879; 2MASS; J19444814+4908244; image processing;photometric; radial Velocities; spectroscopic
Fields of Research (2008): 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems
02 Physical Sciences > 0201 Astronomical and Space Sciences > 020102 Astronomical and Space Instrumentation
Fields of Research (2020): 51 PHYSICAL SCIENCES > 5101 Astronomical sciences > 510109 Stellar astronomy and planetary systems
51 PHYSICAL SCIENCES > 5199 Other physical sciences > 519999 Other physical sciences not elsewhere classified
Socio-Economic Objectives (2008): E Expanding Knowledge > 97 Expanding Knowledge > 970102 Expanding Knowledge in the Physical Sciences
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