High-precision transit observations of the exoplanet WASP-13b with the RISE instrument
WASP-13b is a sub-Jupiter mass exoplanet orbiting a G1V type star with a period of 4.35d. The current uncertainty in its impact parameter (0 < b < 0.46) results in poorly defined stellar and planetary radii. To better constrain the impact parameter, we have obtained high-precision tran...
| Main Authors: | , , , , , |
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| Format: | Journal article |
| Language: | English |
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2012
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| _version_ | 1797101493609824256 |
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| author | Barros, S Pollacco, D Gibson, N Keenan, F Skillen, I Steele, I |
| author_facet | Barros, S Pollacco, D Gibson, N Keenan, F Skillen, I Steele, I |
| author_sort | Barros, S |
| collection | OXFORD |
| description | WASP-13b is a sub-Jupiter mass exoplanet orbiting a G1V type star with a period of 4.35d. The current uncertainty in its impact parameter (0 < b < 0.46) results in poorly defined stellar and planetary radii. To better constrain the impact parameter, we have obtained high-precision transit observations with the rapid imager to search for exoplanets (RISE) instrument mounted on 2.0-m Liverpool Telescope. We present four new transits which are fitted with a Markov chain Monte Carlo routine to derive accurate system parameters. We found an orbital inclination of 852 ± 03 resulting in stellar and planetary radii of 1.56 ± 0.04R⊙ and 1.39 ± 0.05RJup, respectively. This suggests that the host star has evolved off the main sequence and is in the hydrogen-shell-burning phase. We also discuss how the limb darkening affects the derived system parameters. With a density of 0.17ρJ, WASP-13b joins the group of low-density planets whose radii are too large to be explained by standard irradiation models. We derive a new ephemeris for the system, T0= 2455575.5136 ± 0.0016 (HJD) and P= 4.353011 ± 0.000013d. The planet equilibrium temperature (Tequ= 1500K) and the bright host star (V= 10.4mag) make it a good candidate for follow-up atmospheric studies. © 2011 The Authors Monthly Notices of the Royal Astronomical Society © 2011 RAS. |
| first_indexed | 2024-03-07T05:52:45Z |
| format | Journal article |
| id | oxford-uuid:e97554ad-4cb1-4fc9-9a36-6a357dfbee66 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T05:52:45Z |
| publishDate | 2012 |
| record_format | dspace |
| spelling | oxford-uuid:e97554ad-4cb1-4fc9-9a36-6a357dfbee662022-03-27T10:54:32ZHigh-precision transit observations of the exoplanet WASP-13b with the RISE instrumentJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:e97554ad-4cb1-4fc9-9a36-6a357dfbee66EnglishSymplectic Elements at Oxford2012Barros, SPollacco, DGibson, NKeenan, FSkillen, ISteele, IWASP-13b is a sub-Jupiter mass exoplanet orbiting a G1V type star with a period of 4.35d. The current uncertainty in its impact parameter (0 < b < 0.46) results in poorly defined stellar and planetary radii. To better constrain the impact parameter, we have obtained high-precision transit observations with the rapid imager to search for exoplanets (RISE) instrument mounted on 2.0-m Liverpool Telescope. We present four new transits which are fitted with a Markov chain Monte Carlo routine to derive accurate system parameters. We found an orbital inclination of 852 ± 03 resulting in stellar and planetary radii of 1.56 ± 0.04R⊙ and 1.39 ± 0.05RJup, respectively. This suggests that the host star has evolved off the main sequence and is in the hydrogen-shell-burning phase. We also discuss how the limb darkening affects the derived system parameters. With a density of 0.17ρJ, WASP-13b joins the group of low-density planets whose radii are too large to be explained by standard irradiation models. We derive a new ephemeris for the system, T0= 2455575.5136 ± 0.0016 (HJD) and P= 4.353011 ± 0.000013d. The planet equilibrium temperature (Tequ= 1500K) and the bright host star (V= 10.4mag) make it a good candidate for follow-up atmospheric studies. © 2011 The Authors Monthly Notices of the Royal Astronomical Society © 2011 RAS. |
| spellingShingle | Barros, S Pollacco, D Gibson, N Keenan, F Skillen, I Steele, I High-precision transit observations of the exoplanet WASP-13b with the RISE instrument |
| title | High-precision transit observations of the exoplanet WASP-13b with the RISE instrument |
| title_full | High-precision transit observations of the exoplanet WASP-13b with the RISE instrument |
| title_fullStr | High-precision transit observations of the exoplanet WASP-13b with the RISE instrument |
| title_full_unstemmed | High-precision transit observations of the exoplanet WASP-13b with the RISE instrument |
| title_short | High-precision transit observations of the exoplanet WASP-13b with the RISE instrument |
| title_sort | high precision transit observations of the exoplanet wasp 13b with the rise instrument |
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