Investigating Transit Timing Variations in the Ultrashort Period Exoplanet WASP-19b
In this study, we present a comprehensive analysis of transit timing variations (TTVs) in the ultrashort-period gas giant WASP-19b, which orbits a G-type main-sequence star. Our analysis is based on a data set comprising 204 transit light curves (LCs) obtained from the Transiting Exoplanet Survey Sa...
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2025-01-01
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| Online Access: | https://doi.org/10.3847/1538-3881/ade998 |
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| author | Shraddha Biswas Ing-Guey Jiang Li-Chin Yeh Hsin-Min Liu Kaviya Parthasarathy Devesh P. Sariya D. Bisht Mohit Singh Bisht A. Raj |
| author_facet | Shraddha Biswas Ing-Guey Jiang Li-Chin Yeh Hsin-Min Liu Kaviya Parthasarathy Devesh P. Sariya D. Bisht Mohit Singh Bisht A. Raj |
| author_sort | Shraddha Biswas |
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| description | In this study, we present a comprehensive analysis of transit timing variations (TTVs) in the ultrashort-period gas giant WASP-19b, which orbits a G-type main-sequence star. Our analysis is based on a data set comprising 204 transit light curves (LCs) obtained from the Transiting Exoplanet Survey Satellite, the Exoplanet Transit Database, and the ExoClock project, supplemented by 18 publicly available LCs. Mid-transit times were extracted from these data, and an additional 98 mid-transit times compiled from the literature were incorporated, resulting in a combined data set spanning 14 yr. After excluding LCs significantly impacted by stellar activity, such as starspot anomalies, the final data set consisted of 252 high-quality mid-transit times. Initial inspection of the transit timing residuals using an apsidal precession model suggested the possible presence of an additional planetary companion. However, subsequent frequency analysis and sinusoidal model fitting indicate that the observed TTVs are more consistently explained by apsidal precession of WASP-19b’s orbit. We also considered alternative mechanisms, including the Applegate mechanism and the Shklovskii effect. Our findings suggest that stellar magnetic activity, potentially linked to the Applegate mechanism, may also contribute to the observed timing variations. To further constrain the origin of the TTVs and assess the contributions of these mechanisms, continued high-precision photometric monitoring of the WASP-19 system is strongly recommended. |
| format | Article |
| id | doaj-art-38181e2867ed45d6b901b36818318235 |
| institution | Matheson Library |
| issn | 1538-3881 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
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| series | The Astronomical Journal |
| spelling | doaj-art-38181e2867ed45d6b901b368183182352025-07-31T09:07:36ZengIOP PublishingThe Astronomical Journal1538-38812025-01-01170213310.3847/1538-3881/ade998Investigating Transit Timing Variations in the Ultrashort Period Exoplanet WASP-19bShraddha Biswas0https://orcid.org/0009-0003-8446-4557Ing-Guey Jiang1https://orcid.org/0000-0001-7359-3300Li-Chin Yeh2https://orcid.org/0000-0001-8677-0521Hsin-Min Liu3Kaviya Parthasarathy4Devesh P. Sariya5https://orcid.org/0000-0001-8452-7667D. Bisht6https://orcid.org/0000-0002-8988-8434Mohit Singh Bisht7A. Raj8Indian Centre for Space Physics , 466 Barakhola, Netai Nagar, Kolkata, West Bengal 700099, India ; hiyabiswas12@gmail.com, devendrabisht297@gmail.comDepartment of Physics and Institute of Astronomy, National Tsing Hua University , Hsinchu 30013, Taiwan ; jiang@phys.nthu.edu.twInstitute of Computational and Modeling Science, National Tsing Hua University , Hsinchu 30013, Taiwan ; lichinyeh@mx.nthu.edu.twDepartment of Physics and Institute of Astronomy, National Tsing Hua University , Hsinchu 30013, Taiwan ; jiang@phys.nthu.edu.twDepartment of Physics and Institute of Astronomy, National Tsing Hua University , Hsinchu 30013, Taiwan ; jiang@phys.nthu.edu.twDepartment of Physics and Institute of Astronomy, National Tsing Hua University , Hsinchu 30013, Taiwan ; jiang@phys.nthu.edu.twIndian Centre for Space Physics , 466 Barakhola, Netai Nagar, Kolkata, West Bengal 700099, India ; hiyabiswas12@gmail.com, devendrabisht297@gmail.comIndian Centre for Space Physics , 466 Barakhola, Netai Nagar, Kolkata, West Bengal 700099, India ; hiyabiswas12@gmail.com, devendrabisht297@gmail.comIndian Centre for Space Physics , 466 Barakhola, Netai Nagar, Kolkata, West Bengal 700099, India ; hiyabiswas12@gmail.com, devendrabisht297@gmail.com; Uttar Pradesh State Institute of Forensic Science (UPSIFS) , Aurawan, P.O. Banthra, Lucknow 226401, U.P., IndiaIn this study, we present a comprehensive analysis of transit timing variations (TTVs) in the ultrashort-period gas giant WASP-19b, which orbits a G-type main-sequence star. Our analysis is based on a data set comprising 204 transit light curves (LCs) obtained from the Transiting Exoplanet Survey Satellite, the Exoplanet Transit Database, and the ExoClock project, supplemented by 18 publicly available LCs. Mid-transit times were extracted from these data, and an additional 98 mid-transit times compiled from the literature were incorporated, resulting in a combined data set spanning 14 yr. After excluding LCs significantly impacted by stellar activity, such as starspot anomalies, the final data set consisted of 252 high-quality mid-transit times. Initial inspection of the transit timing residuals using an apsidal precession model suggested the possible presence of an additional planetary companion. However, subsequent frequency analysis and sinusoidal model fitting indicate that the observed TTVs are more consistently explained by apsidal precession of WASP-19b’s orbit. We also considered alternative mechanisms, including the Applegate mechanism and the Shklovskii effect. Our findings suggest that stellar magnetic activity, potentially linked to the Applegate mechanism, may also contribute to the observed timing variations. To further constrain the origin of the TTVs and assess the contributions of these mechanisms, continued high-precision photometric monitoring of the WASP-19 system is strongly recommended.https://doi.org/10.3847/1538-3881/ade998ExoplanetsHot JupitersTransit timing variation method |
| spellingShingle | Shraddha Biswas Ing-Guey Jiang Li-Chin Yeh Hsin-Min Liu Kaviya Parthasarathy Devesh P. Sariya D. Bisht Mohit Singh Bisht A. Raj Investigating Transit Timing Variations in the Ultrashort Period Exoplanet WASP-19b The Astronomical Journal Exoplanets Hot Jupiters Transit timing variation method |
| title | Investigating Transit Timing Variations in the Ultrashort Period Exoplanet WASP-19b |
| title_full | Investigating Transit Timing Variations in the Ultrashort Period Exoplanet WASP-19b |
| title_fullStr | Investigating Transit Timing Variations in the Ultrashort Period Exoplanet WASP-19b |
| title_full_unstemmed | Investigating Transit Timing Variations in the Ultrashort Period Exoplanet WASP-19b |
| title_short | Investigating Transit Timing Variations in the Ultrashort Period Exoplanet WASP-19b |
| title_sort | investigating transit timing variations in the ultrashort period exoplanet wasp 19b |
| topic | Exoplanets Hot Jupiters Transit timing variation method |
| url | https://doi.org/10.3847/1538-3881/ade998 |
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