Kepler-15b

A hot Jupiter enriched in heavy elements and the first Kepler mission planet confirmed with the Hobby-Eberly Telescope

Michael Endl, Phillip J. MacQueen, William D. Cochran, Erik J. Brugamyer, Lars A. Buchhave, Jason Rowe, Phillip Lucas, Howard Isaacson, Steve Bryson, Steve B. Howell, Jonathan J. Fortney, Terese Hansen, William J. Borucki, Douglas Caldwell, Jessie L. Christiansen, David R. Ciardi, Brice Olivier Demory, Mark Everett, Eric B. Ford, Michael R. Haas & 13 others Matthew J. Holman, Elliott Horch, Jon M. Jenkins, David J. Koch, Jack J. Lissauer, Pavel MacHalek, Martin Still, William F. Welsh, Dwight T. Sanderfer, Shawn E. Seader, Jeffrey C. Smith, Susan E. Thompson, Joseph D. Twicken

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

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 .

Original languageEnglish (US)
Article number13
JournalAstrophysical Journal, Supplement Series
Volume197
Issue number1
DOIs
StatePublished - Nov 1 2011

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Kepler mission
heavy elements
Jupiter (planet)
Jupiter
planets
planet
spectrographs
telescopes
transit
radial velocity
high resolution
radii
main sequence stars
extrasolar planets
iodine
velocity measurement
bulk density
photometry
irradiation
orbits

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Endl, Michael ; MacQueen, Phillip J. ; Cochran, William D. ; Brugamyer, Erik J. ; Buchhave, Lars A. ; Rowe, Jason ; Lucas, Phillip ; Isaacson, Howard ; Bryson, Steve ; Howell, Steve B. ; Fortney, Jonathan J. ; Hansen, Terese ; Borucki, William J. ; Caldwell, Douglas ; Christiansen, Jessie L. ; Ciardi, David R. ; Demory, Brice Olivier ; Everett, Mark ; Ford, Eric B. ; Haas, Michael R. ; Holman, Matthew J. ; Horch, Elliott ; Jenkins, Jon M. ; Koch, David J. ; Lissauer, Jack J. ; MacHalek, Pavel ; Still, Martin ; Welsh, William F. ; Sanderfer, Dwight T. ; Seader, Shawn E. ; Smith, Jeffrey C. ; Thompson, Susan E. ; Twicken, Joseph D. / Kepler-15b : A hot Jupiter enriched in heavy elements and the first Kepler mission planet confirmed with the Hobby-Eberly Telescope. In: Astrophysical Journal, Supplement Series. 2011 ; Vol. 197, No. 1.
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abstract = "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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Endl, M, MacQueen, PJ, Cochran, WD, Brugamyer, EJ, Buchhave, LA, Rowe, J, Lucas, P, Isaacson, H, Bryson, S, Howell, SB, Fortney, JJ, Hansen, T, Borucki, WJ, Caldwell, D, Christiansen, JL, Ciardi, DR, Demory, BO, Everett, M, Ford, EB, Haas, MR, Holman, MJ, Horch, E, Jenkins, JM, Koch, DJ, Lissauer, JJ, MacHalek, P, Still, M, Welsh, WF, Sanderfer, DT, Seader, SE, Smith, JC, Thompson, SE & Twicken, JD 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, vol. 197, no. 1, 13. https://doi.org/10.1088/0067-0049/197/1/13

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

In: Astrophysical Journal, Supplement Series, Vol. 197, No. 1, 13, 01.11.2011.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Kepler-15b

T2 - A hot Jupiter enriched in heavy elements and the first Kepler mission planet confirmed with the Hobby-Eberly Telescope

AU - Endl, Michael

AU - MacQueen, Phillip J.

AU - Cochran, William D.

AU - Brugamyer, Erik J.

AU - Buchhave, Lars A.

AU - Rowe, Jason

AU - Lucas, Phillip

AU - Isaacson, Howard

AU - Bryson, Steve

AU - Howell, Steve B.

AU - Fortney, Jonathan J.

AU - Hansen, Terese

AU - Borucki, William J.

AU - Caldwell, Douglas

AU - Christiansen, Jessie L.

AU - Ciardi, David R.

AU - Demory, Brice Olivier

AU - Everett, Mark

AU - Ford, Eric B.

AU - Haas, Michael R.

AU - Holman, Matthew J.

AU - Horch, Elliott

AU - Jenkins, Jon M.

AU - Koch, David J.

AU - Lissauer, Jack J.

AU - MacHalek, Pavel

AU - Still, Martin

AU - Welsh, William F.

AU - Sanderfer, Dwight T.

AU - Seader, Shawn E.

AU - Smith, Jeffrey C.

AU - Thompson, Susan E.

AU - Twicken, Joseph D.

PY - 2011/11/1

Y1 - 2011/11/1

N2 - 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 ⊕.

AB - 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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