uGMRT Survey of EXoplanets Around M-dwarfs (GS-EXAM): Radio Observations of GJ 1151

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dc.contributor.authorNarang, Mayank
dc.contributor.authorPuravankara, Manoj
dc.contributor.authorVedantham, H. K.
dc.contributor.authorIshwara-Chandra, C. H.
dc.contributor.authorDe, Ayanabha
dc.contributor.authorTyagi, Himanshu
dc.contributor.authorBanerjee, Bihan
dc.contributor.authorNayak, Prasanta K.
dc.contributor.authorSurya, Arun
dc.contributor.authorShridharan, B.
dc.contributor.authorPathak, Vinod C.
dc.contributor.authorTripathi, Mihir
dc.date.accessioned2025-01-20T16:04:29Z
dc.date.available2025-01-20T16:04:29Z
dc.date.issued2024
dc.description.abstractCoherent radio emission with properties similar to planetary auroral signals has been reported from GJ 1151, a quiescent, slow-rotating mid-M star, by the LOFAR Two-meter (120-170 MHz) Sky Survey. The observed LOFAR emission is fairly bright at 0.89 mJy with 64% circular polarization, and the emission characteristics are consistent with the interaction between an Earth-sized planet with an orbital period of 1-5 days and the magnetic field of the host star. However, no short-period planet has been detected around GJ 1151. To confirm the reported radio emission caused by the putative planet around GJ 1151 and to investigate the nature of this emission, we carried out upgraded Giant Metrewave Radio Telescope observations of GJ 1151 at 150, 218, and 400 MHz over 33 hr across ten epochs. No emission was detected at any frequency. While at 150 and 218 MHz, nondetection could be due to the low sensitivity of our observations, at 400 MHz, the rms sensitivities achieved were sufficient to detect the emission observed with LOFAR at similar to 20 sigma level. Our findings suggest that the radio emission is highly time variable, likely influenced by the star-planet system's phase and the host star's magnetic field. Additional observations below 170 MHz, at more frequent epochs (as the periodicity of the emission is unknown), especially during periods of high stellar magnetic field strength, are needed to confirm the emission.
dc.description.funderDepartment of Atomic Energy, Government of India
dc.fuente.origenWOS
dc.identifier.doi10.3847/1538-3881/ad84e4
dc.identifier.eissn1538-3881
dc.identifier.issn0004-6256
dc.identifier.urihttps://doi.org/10.3847/1538-3881/ad84e4
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/89776
dc.identifier.wosidWOS:001355330200001
dc.issue.numero6
dc.language.isoen
dc.revistaAstronomical journal
dc.rightsacceso restringido
dc.titleuGMRT Survey of EXoplanets Around M-dwarfs (GS-EXAM): Radio Observations of GJ 1151
dc.typeartículo
dc.volumen168
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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