Characterizing the cool KOIs. II. the M dwarf KOI-254 and its hot Jupiter

John Asher Johnson; J. Zachary Gazak; Kevin Apps; Philip S. Muirhead; Justin R. Crepp; Ian J.M. Crossfield; Boyajian Tabetha Boyajian; Kaspar Von Braun; Barbara Rojas-Ayala; Andrew W. Howard; Kevin R. Covey; Everett Schlawin; Katherine Hamren; Timothy D. Morton; Geoffrey W. Marcy; James P. Lloyd

doi:10.1088/0004-6256/143/5/111

Characterizing the cool KOIs. II. the M dwarf KOI-254 and its hot Jupiter

John Asher Johnson, J. Zachary Gazak, Kevin Apps, Philip S. Muirhead, Justin R. Crepp, Ian J.M. Crossfield, Boyajian Tabetha Boyajian, Kaspar Von Braun, Barbara Rojas-Ayala, Andrew W. Howard, Kevin R. Covey, Everett Schlawin, Katherine Hamren, Timothy D. Morton, Geoffrey W. Marcy, James P. Lloyd

Research output: Contribution to journal › Article › peer-review

143 Scopus citations

Abstract

We report the confirmation and characterization of a transiting gas giant planet orbiting the M dwarf KOI-254 every 2.455239days, which was originally discovered by the Kepler mission. We use radial velocity measurements, adaptive optics imaging, and near-infrared spectroscopy to confirm the planetary nature of the transit events. KOI-254b is the first hot Jupiter discovered around an M-type dwarf star. We also present a new model-independent method of using broadband photometry to estimate the mass and metallicity of an M dwarf without relying on a direct distance measurement. Included in this methodology is a new photometric metallicity calibration based on J - K colors. We use this technique to measure the physical properties of KOI-254 and its planet. We measure a planet mass of M _P = 0.505 M _Jup, radius R _P = 0.96 R _Jup, and semimajor axis a = 0.030 AU, based on our measured stellar mass M = 0.59 M and radius R = 0.55 R. We also find that the host star is metal-rich, which is consistent with the sample of M-type stars known to harbor giant planets.

Original language	English (US)
Article number	111
Journal	Astronomical Journal
Volume	143
Issue number	5
DOIs	https://doi.org/10.1088/0004-6256/143/5/111
State	Published - May 2012
Externally published	Yes

Keywords

planetary systems
techniques: photometric
techniques: radial velocities
techniques: spectroscopic

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1088/0004-6256/143/5/111

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Johnson, J. A., Gazak, J. Z., Apps, K., Muirhead, P. S., Crepp, J. R., Crossfield, I. J. M., Tabetha Boyajian, B., Von Braun, K., Rojas-Ayala, B., Howard, A. W., Covey, K. R., Schlawin, E., Hamren, K., Morton, T. D., Marcy, G. W., & Lloyd, J. P. (2012). Characterizing the cool KOIs. II. the M dwarf KOI-254 and its hot Jupiter. Astronomical Journal, 143(5), Article 111. https://doi.org/10.1088/0004-6256/143/5/111

Johnson, JA, Gazak, JZ, Apps, K, Muirhead, PS, Crepp, JR, Crossfield, IJM, Tabetha Boyajian, B, Von Braun, K, Rojas-Ayala, B, Howard, AW, Covey, KR, Schlawin, E, Hamren, K, Morton, TD, Marcy, GW & Lloyd, JP 2012, 'Characterizing the cool KOIs. II. the M dwarf KOI-254 and its hot Jupiter', Astronomical Journal, vol. 143, no. 5, 111. https://doi.org/10.1088/0004-6256/143/5/111

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abstract = "We report the confirmation and characterization of a transiting gas giant planet orbiting the M dwarf KOI-254 every 2.455239days, which was originally discovered by the Kepler mission. We use radial velocity measurements, adaptive optics imaging, and near-infrared spectroscopy to confirm the planetary nature of the transit events. KOI-254b is the first hot Jupiter discovered around an M-type dwarf star. We also present a new model-independent method of using broadband photometry to estimate the mass and metallicity of an M dwarf without relying on a direct distance measurement. Included in this methodology is a new photometric metallicity calibration based on J - K colors. We use this technique to measure the physical properties of KOI-254 and its planet. We measure a planet mass of M P = 0.505 M Jup, radius R P = 0.96 R Jup, and semimajor axis a = 0.030 AU, based on our measured stellar mass M = 0.59 M and radius R = 0.55 R. We also find that the host star is metal-rich, which is consistent with the sample of M-type stars known to harbor giant planets.",

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author = "Johnson, {John Asher} and Gazak, {J. Zachary} and Kevin Apps and Muirhead, {Philip S.} and Crepp, {Justin R.} and Crossfield, {Ian J.M.} and {Tabetha Boyajian}, Boyajian and {Von Braun}, Kaspar and Barbara Rojas-Ayala and Howard, {Andrew W.} and Covey, {Kevin R.} and Everett Schlawin and Katherine Hamren and Morton, {Timothy D.} and Marcy, {Geoffrey W.} and Lloyd, {James P.}",

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AU - Johnson, John Asher

AU - Gazak, J. Zachary

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AU - Muirhead, Philip S.

AU - Crepp, Justin R.

AU - Crossfield, Ian J.M.

AU - Tabetha Boyajian, Boyajian

AU - Von Braun, Kaspar

AU - Rojas-Ayala, Barbara

AU - Howard, Andrew W.

AU - Covey, Kevin R.

AU - Schlawin, Everett

AU - Hamren, Katherine

AU - Morton, Timothy D.

AU - Marcy, Geoffrey W.

AU - Lloyd, James P.

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N2 - We report the confirmation and characterization of a transiting gas giant planet orbiting the M dwarf KOI-254 every 2.455239days, which was originally discovered by the Kepler mission. We use radial velocity measurements, adaptive optics imaging, and near-infrared spectroscopy to confirm the planetary nature of the transit events. KOI-254b is the first hot Jupiter discovered around an M-type dwarf star. We also present a new model-independent method of using broadband photometry to estimate the mass and metallicity of an M dwarf without relying on a direct distance measurement. Included in this methodology is a new photometric metallicity calibration based on J - K colors. We use this technique to measure the physical properties of KOI-254 and its planet. We measure a planet mass of M P = 0.505 M Jup, radius R P = 0.96 R Jup, and semimajor axis a = 0.030 AU, based on our measured stellar mass M = 0.59 M and radius R = 0.55 R. We also find that the host star is metal-rich, which is consistent with the sample of M-type stars known to harbor giant planets.

AB - We report the confirmation and characterization of a transiting gas giant planet orbiting the M dwarf KOI-254 every 2.455239days, which was originally discovered by the Kepler mission. We use radial velocity measurements, adaptive optics imaging, and near-infrared spectroscopy to confirm the planetary nature of the transit events. KOI-254b is the first hot Jupiter discovered around an M-type dwarf star. We also present a new model-independent method of using broadband photometry to estimate the mass and metallicity of an M dwarf without relying on a direct distance measurement. Included in this methodology is a new photometric metallicity calibration based on J - K colors. We use this technique to measure the physical properties of KOI-254 and its planet. We measure a planet mass of M P = 0.505 M Jup, radius R P = 0.96 R Jup, and semimajor axis a = 0.030 AU, based on our measured stellar mass M = 0.59 M and radius R = 0.55 R. We also find that the host star is metal-rich, which is consistent with the sample of M-type stars known to harbor giant planets.

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KW - techniques: spectroscopic

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Characterizing the cool KOIs. II. the M dwarf KOI-254 and its hot Jupiter

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