KELT-7b: A HOT JUPITER TRANSITING A BRIGHT V = 8.54 RAPIDLY ROTATING F-STAR
We report the discovery of KELT-7b, a transiting hot Jupiter with a mass of 1.28 ± 0.18 M[subscript J], radius of 1.533[+0.046 over -0.047] R[subscript J], and an orbital period of 2.7347749 ± 0.0000039 days. The bright host star (HD 33643; KELT-7) is an F-star with V = 8.54, T[subscript eff] = 6789...
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| Format: | Article |
| Language: | en_US |
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IOP Publishing
2015
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| Online Access: | http://hdl.handle.net/1721.1/98342 https://orcid.org/0000-0002-4265-047X |
| _version_ | 1811073976124833792 |
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| author | Winn, Joshua Nathan |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Winn, Joshua Nathan |
| author_sort | Winn, Joshua Nathan |
| collection | MIT |
| description | We report the discovery of KELT-7b, a transiting hot Jupiter with a mass of 1.28 ± 0.18 M[subscript J], radius of 1.533[+0.046 over -0.047] R[subscript J], and an orbital period of 2.7347749 ± 0.0000039 days. The bright host star (HD 33643; KELT-7) is an F-star with V = 8.54, T[subscript eff] = 6789[+50 over -49] K, [Fe/H] = 0.139[+0.075 over -0.081], and log g = 4.149 ± 0.019]. It has a mass of 1.535 [+0.066 over -0.054] M[subscript ⊙], a radius of 1.732[+0.043 over -0.045] R[subscript ⊙], and is the fifth most massive, fifth hottest, and the ninth brightest star known to host a transiting planet. It is also the brightest star around which Kilodegree Extremely Little Telescope (KELT) has discovered a transiting planet. Thus, KELT-7b is an ideal target for detailed characterization given its relatively low surface gravity, high equilibrium temperature, and bright host star. The rapid rotation of the star (73 ± 0.5 km s[superscript −1]) results in a Rossiter–McLaughlin effect with an unusually large amplitude of several hundred m s[superscript −1]. We find that the orbit normal of the planet is likely to be well-aligned with the stellar spin axis, with a projected spin–orbit alignment of λ = 9[° over .]7 ± 5[° over .]2. This is currently the second most rapidly rotating star to have a reflex signal (and thus mass determination) due to a planetary companion measured. |
| first_indexed | 2024-09-23T09:41:07Z |
| format | Article |
| id | mit-1721.1/98342 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T09:41:07Z |
| publishDate | 2015 |
| publisher | IOP Publishing |
| record_format | dspace |
| spelling | mit-1721.1/983422022-09-30T16:09:16Z KELT-7b: A HOT JUPITER TRANSITING A BRIGHT V = 8.54 RAPIDLY ROTATING F-STAR Winn, Joshua Nathan Massachusetts Institute of Technology. Department of Physics MIT Kavli Institute for Astrophysics and Space Research Winn, Joshua Nathan We report the discovery of KELT-7b, a transiting hot Jupiter with a mass of 1.28 ± 0.18 M[subscript J], radius of 1.533[+0.046 over -0.047] R[subscript J], and an orbital period of 2.7347749 ± 0.0000039 days. The bright host star (HD 33643; KELT-7) is an F-star with V = 8.54, T[subscript eff] = 6789[+50 over -49] K, [Fe/H] = 0.139[+0.075 over -0.081], and log g = 4.149 ± 0.019]. It has a mass of 1.535 [+0.066 over -0.054] M[subscript ⊙], a radius of 1.732[+0.043 over -0.045] R[subscript ⊙], and is the fifth most massive, fifth hottest, and the ninth brightest star known to host a transiting planet. It is also the brightest star around which Kilodegree Extremely Little Telescope (KELT) has discovered a transiting planet. Thus, KELT-7b is an ideal target for detailed characterization given its relatively low surface gravity, high equilibrium temperature, and bright host star. The rapid rotation of the star (73 ± 0.5 km s[superscript −1]) results in a Rossiter–McLaughlin effect with an unusually large amplitude of several hundred m s[superscript −1]. We find that the orbit normal of the planet is likely to be well-aligned with the stellar spin axis, with a projected spin–orbit alignment of λ = 9[° over .]7 ± 5[° over .]2. This is currently the second most rapidly rotating star to have a reflex signal (and thus mass determination) due to a planetary companion measured. United States. National Aeronautics and Space Administration (Origins Program Grant NNX11AG85G) 2015-09-03T12:33:28Z 2015-09-03T12:33:28Z 2015-06 2015-01 Article http://purl.org/eprint/type/JournalArticle 1538-3881 0004-6256 http://hdl.handle.net/1721.1/98342 Bieryla, Allyson, Karen Collins, Thomas G. Beatty, Jason Eastman, Robert J. Siverd, Joshua Pepper, B. Scott Gaudi, et al. “KELT-7b: A HOT JUPITER TRANSITING A BRIGHT V = 8.54 RAPIDLY ROTATING F-STAR.” The Astronomical Journal 150, no. 1 (June 18, 2015): 12. © 2015 The American Astronomical Society https://orcid.org/0000-0002-4265-047X en_US http://dx.doi.org/10.1088/0004-6256/150/1/12 The Astronomical Journal Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf IOP Publishing IOP Publishing |
| spellingShingle | Winn, Joshua Nathan KELT-7b: A HOT JUPITER TRANSITING A BRIGHT V = 8.54 RAPIDLY ROTATING F-STAR |
| title | KELT-7b: A HOT JUPITER TRANSITING A BRIGHT V = 8.54 RAPIDLY ROTATING F-STAR |
| title_full | KELT-7b: A HOT JUPITER TRANSITING A BRIGHT V = 8.54 RAPIDLY ROTATING F-STAR |
| title_fullStr | KELT-7b: A HOT JUPITER TRANSITING A BRIGHT V = 8.54 RAPIDLY ROTATING F-STAR |
| title_full_unstemmed | KELT-7b: A HOT JUPITER TRANSITING A BRIGHT V = 8.54 RAPIDLY ROTATING F-STAR |
| title_short | KELT-7b: A HOT JUPITER TRANSITING A BRIGHT V = 8.54 RAPIDLY ROTATING F-STAR |
| title_sort | kelt 7b a hot jupiter transiting a bright v 8 54 rapidly rotating f star |
| url | http://hdl.handle.net/1721.1/98342 https://orcid.org/0000-0002-4265-047X |
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