Désert, Jean-Michel; Charbonneau, David; Demory, Brice-Olivier; Ballard, Sarah; Carter, Joshua A.; Fortney, Jonathan J.; Cochran, William D.; Endl, Michael; Quinn, Samuel N.; Isaacson, Howard T.; Fressin, François; Buchhave, Lars A.; Latham, David W.; Knutson, Heather A.; Bryson, Stephen T.; Torres, Guillermo; Rowe, Jason F.; Batalha, Natalie M.; Borucki, William J.; Brown, Timothy M.; ... (2011). THE HOT-JUPITER KEPLER-17b: DISCOVERY, OBLIQUITY FROM STROBOSCOPIC STARSPOTS, AND ATMOSPHERIC CHARACTERIZATION. Astrophysical journal - supplement series, 197(1), p. 14. Institute of Physics Publishing IOP 10.1088/0067-0049/197/1/14
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This paper reports the discovery and characterization of the transiting hot giant exoplanet Kepler-17b. The planet has an orbital period of 1.486 days, and radial velocity measurements from the Hobby–Eberly Telescope show a Doppler signal of 419.5+13.3−15.6 m s−1. From a transit-based estimate of the host star's mean density, combined with an estimate of the stellar effective temperature Teff = 5630 ± 100 from high-resolution spectra, we infer a stellar host mass of 1.06 ± 0.07 M☉ and a stellar radius of 1.02 ± 0.03 R☉. We estimate the planet mass and radius to be MP = 2.45 ± 0.11 MJ and RP = 1.31 ± 0.02 RJ. The host star is active, with dark spots that are frequently occulted by the planet. The continuous monitoring of the star reveals a stellar rotation period of 11.89 days, eight times the planet's orbital period; this period ratio produces stroboscopic effects on the occulted starspots. The temporal pattern of these spot-crossing events shows that the planet's orbit is prograde and the star's obliquity is smaller than 15°. We detected planetary occultations of Kepler-17b with both the Kepler and Spitzer Space Telescopes. We use these observations to constrain the eccentricity, e, and find that it is consistent with a circular orbit (e < 0.011). The brightness temperatures of the planet's infrared bandpasses are T3.6 μm = 1880 ± 100 K and T4.5 μm = 1770 ± 150 K. We measure the optical geometric albedo Ag in the Kepler bandpass and find Ag = 0.10 ± 0.02. The observations are best described by atmospheric models for which most of the incident energy is re-radiated away from the day side.
Item Type: |
Journal Article (Original Article) |
|---|---|
Division/Institute: |
10 Strategic Research Centers > Center for Space and Habitability (CSH) |
UniBE Contributor: |
Demory, Brice-Olivier Denys |
Subjects: |
500 Science > 520 Astronomy |
ISSN: |
0067-0049 |
Publisher: |
Institute of Physics Publishing IOP |
Language: |
English |
Submitter: |
Brice-Olivier Denys Demory |
Date Deposited: |
06 Apr 2022 12:05 |
Last Modified: |
02 Mar 2023 23:34 |
Publisher DOI: |
10.1088/0067-0049/197/1/14 |
BORIS DOI: |
10.48350/153322 |
URI: |
https://boris.unibe.ch/id/eprint/153322 |
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