Radio-loud Exoplanet-exomoon Survey: GMRT Search for Electron Cyclotron Maser Emission
We conducted the first dedicated search for signatures of exoplanet–exomoon interactions using the Giant Metrewave Radio Telescope (GMRT) as part of the radio-loud exoplanet-exomoon survey. Due to stellar tidal heating, irradiation, and subsequent atmospheric escape, candidate “exo-Io” systems are e...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2022-01-01
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| Series: | The Astronomical Journal |
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| Online Access: | https://doi.org/10.3847/1538-3881/ac9eb8 |
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| author | Mayank Narang Apurva V. Oza Kaustubh Hakim P. Manoj Ravinder K. Banyal Daniel P. Thorngren |
| author_facet | Mayank Narang Apurva V. Oza Kaustubh Hakim P. Manoj Ravinder K. Banyal Daniel P. Thorngren |
| author_sort | Mayank Narang |
| collection | DOAJ |
| description | We conducted the first dedicated search for signatures of exoplanet–exomoon interactions using the Giant Metrewave Radio Telescope (GMRT) as part of the radio-loud exoplanet-exomoon survey. Due to stellar tidal heating, irradiation, and subsequent atmospheric escape, candidate “exo-Io” systems are expected to emit up to 10 ^6 times more plasma flux than the Jupiter-Io DC circuit. This can induce detectable radio emission from the exoplanet-exomoon system. We analyze three “exo-Io” candidate stars: WASP-49, HAT-P 12, and HD 189733. We perform 12 hr phase-curve observations of WASP-49b at 400 MHz during primary & secondary transit, as well as first & third quadratures achieving a 3 σ upper limit of 0.18 mJy beam ^−1 averaged over four days. HAT-P 12 was observed with GMRT at 150 and 325 MHz. We further analyzed the archival data of HD 189733 at 325 MHz. No emission was detected from the three systems. However, we place strong upper limits on radio flux density. Given that most exo-Io candidates orbit hot Saturns, we encourage more multiwavelength searches (in particular low frequencies) to span the lower range of exoplanet B-field strengths constrained here. |
| first_indexed | 2024-03-12T03:37:32Z |
| format | Article |
| id | doaj.art-305349d8868f4a3c890d9f321430c887 |
| institution | Directory Open Access Journal |
| issn | 1538-3881 |
| language | English |
| last_indexed | 2024-03-12T03:37:32Z |
| publishDate | 2022-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astronomical Journal |
| spelling | doaj.art-305349d8868f4a3c890d9f321430c8872023-09-03T13:07:52ZengIOP PublishingThe Astronomical Journal1538-38812022-01-011651110.3847/1538-3881/ac9eb8Radio-loud Exoplanet-exomoon Survey: GMRT Search for Electron Cyclotron Maser EmissionMayank Narang0https://orcid.org/0000-0002-0554-1151Apurva V. Oza1https://orcid.org/0000-0002-1655-0715Kaustubh Hakim2https://orcid.org/0000-0003-4815-2874P. Manoj3https://orcid.org/0000-0002-3530-304XRavinder K. Banyal4https://orcid.org/0000-0003-0799-969XDaniel P. Thorngren5https://orcid.org/0000-0002-5113-8558Tata Institute of Fundamental Research , Mumbai, India; Academia Sinica Institute of Astronomy & Astrophysics , 11F of Astro-Math Bldg., No. 1, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan, Republic of ChinaJet Propulsion Laboratory, California Institute of Technology , Pasadena, USA; Physikalisches Institut, Universität Bern , Bern, SwitzerlandUniversity of Bern , Center for Space and Habitability, Bern, SwitzerlandTata Institute of Fundamental Research , Mumbai, IndiaIndian Institute of Astrophysics , Bangalore, IndiaUniversité de Montréal , Quebec, CanadaWe conducted the first dedicated search for signatures of exoplanet–exomoon interactions using the Giant Metrewave Radio Telescope (GMRT) as part of the radio-loud exoplanet-exomoon survey. Due to stellar tidal heating, irradiation, and subsequent atmospheric escape, candidate “exo-Io” systems are expected to emit up to 10 ^6 times more plasma flux than the Jupiter-Io DC circuit. This can induce detectable radio emission from the exoplanet-exomoon system. We analyze three “exo-Io” candidate stars: WASP-49, HAT-P 12, and HD 189733. We perform 12 hr phase-curve observations of WASP-49b at 400 MHz during primary & secondary transit, as well as first & third quadratures achieving a 3 σ upper limit of 0.18 mJy beam ^−1 averaged over four days. HAT-P 12 was observed with GMRT at 150 and 325 MHz. We further analyzed the archival data of HD 189733 at 325 MHz. No emission was detected from the three systems. However, we place strong upper limits on radio flux density. Given that most exo-Io candidates orbit hot Saturns, we encourage more multiwavelength searches (in particular low frequencies) to span the lower range of exoplanet B-field strengths constrained here.https://doi.org/10.3847/1538-3881/ac9eb8Natural satellites (Extrasolar)Radio continuum emissionExoplanetsStar-planet interactions |
| spellingShingle | Mayank Narang Apurva V. Oza Kaustubh Hakim P. Manoj Ravinder K. Banyal Daniel P. Thorngren Radio-loud Exoplanet-exomoon Survey: GMRT Search for Electron Cyclotron Maser Emission The Astronomical Journal Natural satellites (Extrasolar) Radio continuum emission Exoplanets Star-planet interactions |
| title | Radio-loud Exoplanet-exomoon Survey: GMRT Search for Electron Cyclotron Maser Emission |
| title_full | Radio-loud Exoplanet-exomoon Survey: GMRT Search for Electron Cyclotron Maser Emission |
| title_fullStr | Radio-loud Exoplanet-exomoon Survey: GMRT Search for Electron Cyclotron Maser Emission |
| title_full_unstemmed | Radio-loud Exoplanet-exomoon Survey: GMRT Search for Electron Cyclotron Maser Emission |
| title_short | Radio-loud Exoplanet-exomoon Survey: GMRT Search for Electron Cyclotron Maser Emission |
| title_sort | radio loud exoplanet exomoon survey gmrt search for electron cyclotron maser emission |
| topic | Natural satellites (Extrasolar) Radio continuum emission Exoplanets Star-planet interactions |
| url | https://doi.org/10.3847/1538-3881/ac9eb8 |
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