Starspots, spin-orbit misalignment, and active latitudes in the HAT-P-11 exoplanetary system
We present the analysis of 4 months of Kepler photometry of the K4V star HAT-P-11, including 26 transits of its “super-Neptune” planet. The transit data exhibit numerous anomalies that we interpret as passages of the planet over dark starspots. These spot-crossing anomalies preferentially occur at...
| প্রধান লেখক: | , |
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| অন্যান্য লেখক: | |
| বিন্যাস: | প্রবন্ধ |
| ভাষা: | en_US |
| প্রকাশিত: |
IOP Publishing
2012
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| অনলাইন ব্যবহার করুন: | http://hdl.handle.net/1721.1/71997 https://orcid.org/0000-0002-4265-047X |
| _version_ | 1826203024734814208 |
|---|---|
| author | Sanchis Ojeda, Roberto Winn, Joshua Nathan |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Sanchis Ojeda, Roberto Winn, Joshua Nathan |
| author_sort | Sanchis Ojeda, Roberto |
| collection | MIT |
| description | We present the analysis of 4 months of Kepler photometry of the K4V star HAT-P-11, including 26 transits
of its “super-Neptune” planet. The transit data exhibit numerous anomalies that we interpret as passages of
the planet over dark starspots. These spot-crossing anomalies preferentially occur at two specific phases of
the transit. These phases can be understood as the intersection points between the transit chord and the active
latitudes of the host star, where starspots are most abundant. Based on the measured characteristics of spotcrossing
anomalies, and previous observations of the Rossiter-McLaughlin effect, we find two solutions for
the stellar obliquity ψ and active latitude l: either ψ = 106[superscript +15 over
-11] and l = 19.7[superscript +1.5 over
-2.2], or ψ = 97[superscript +8
over -4] and l = 67[superscript +2 over
-4] (all in
degrees). If the active latitude changes with time in analogy with the “butterfly diagram” of the Sun’s activity
cycle, future observations should reveal changes in the preferred phases of spot-crossing anomalies.
Subject headings: planetary systems—stars: individual (HAT-P-11), rotation, spots, activity |
| first_indexed | 2024-09-23T12:30:30Z |
| format | Article |
| id | mit-1721.1/71997 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T12:30:30Z |
| publishDate | 2012 |
| publisher | IOP Publishing |
| record_format | dspace |
| spelling | mit-1721.1/719972022-10-01T09:24:57Z Starspots, spin-orbit misalignment, and active latitudes in the HAT-P-11 exoplanetary system Sanchis Ojeda, Roberto Winn, Joshua Nathan Massachusetts Institute of Technology. Department of Physics MIT Kavli Institute for Astrophysics and Space Research Winn, Joshua Nathan Sanchis Ojeda, Roberto Winn, Joshua Nathan We present the analysis of 4 months of Kepler photometry of the K4V star HAT-P-11, including 26 transits of its “super-Neptune” planet. The transit data exhibit numerous anomalies that we interpret as passages of the planet over dark starspots. These spot-crossing anomalies preferentially occur at two specific phases of the transit. These phases can be understood as the intersection points between the transit chord and the active latitudes of the host star, where starspots are most abundant. Based on the measured characteristics of spotcrossing anomalies, and previous observations of the Rossiter-McLaughlin effect, we find two solutions for the stellar obliquity ψ and active latitude l: either ψ = 106[superscript +15 over -11] and l = 19.7[superscript +1.5 over -2.2], or ψ = 97[superscript +8 over -4] and l = 67[superscript +2 over -4] (all in degrees). If the active latitude changes with time in analogy with the “butterfly diagram” of the Sun’s activity cycle, future observations should reveal changes in the preferred phases of spot-crossing anomalies. Subject headings: planetary systems—stars: individual (HAT-P-11), rotation, spots, activity United States. National Aeronautics and Space Administration (Origins program grant NNX11AG85G) 2012-08-06T20:29:42Z 2012-08-06T20:29:42Z 2011-11 2011-07 Article http://purl.org/eprint/type/JournalArticle 0004-637X 1538-4357 http://hdl.handle.net/1721.1/71997 Sanchis-Ojeda, Roberto, and Joshua N. Winn. “Starspots, spin-orbit misalignment, and active latitudes in the HAT-P-11 exoplanetary system.” The Astrophysical Journal 743.1 (2011): 61. https://orcid.org/0000-0002-4265-047X en_US http://dx.doi.org/10.1088/0004-637x/743/1/61 Astrophysical Journal Creative Commons Attribution-Noncommercial-Share Alike 3.0 http://creativecommons.org/licenses/by-nc-sa/3.0/ application/pdf IOP Publishing Prof. Winn via Mat Willmott |
| spellingShingle | Sanchis Ojeda, Roberto Winn, Joshua Nathan Starspots, spin-orbit misalignment, and active latitudes in the HAT-P-11 exoplanetary system |
| title | Starspots, spin-orbit misalignment, and active latitudes in the HAT-P-11 exoplanetary system |
| title_full | Starspots, spin-orbit misalignment, and active latitudes in the HAT-P-11 exoplanetary system |
| title_fullStr | Starspots, spin-orbit misalignment, and active latitudes in the HAT-P-11 exoplanetary system |
| title_full_unstemmed | Starspots, spin-orbit misalignment, and active latitudes in the HAT-P-11 exoplanetary system |
| title_short | Starspots, spin-orbit misalignment, and active latitudes in the HAT-P-11 exoplanetary system |
| title_sort | starspots spin orbit misalignment and active latitudes in the hat p 11 exoplanetary system |
| url | http://hdl.handle.net/1721.1/71997 https://orcid.org/0000-0002-4265-047X |
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