Astronomy & Telescopes

A uGMRT Search For Radio Emission From Planets Around Evolved Stars

By Keith Cowing
Status Report
February 21, 2024
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A uGMRT Search For Radio Emission From Planets Around Evolved Stars
The orbital distance and mass distribution of all exoplanet systems that have a targeted observation at low frequency (< 2 GHz) are shown as grey squares. These grey squares are overplotted on the current distribution of all known exoplanets (retrieved on 2023 September 11). The planets around main sequence stars are shown in blue solid circles while the planets around evolved stars are shown as red solid circles. We also mark the position of 𝛼 Tau b, 𝛽 UMi b, and 𝛽 Gem b, the three exoplanets that we study in this work as green circles. -- astro-ph.EP

In this work, we present the results from a study using the Giant Meterwave Radio Telescope (GMRT) to search for radio {emission} from planets around three evolved stars namely α~Tau, β~UMi, and β~Gem.

Both α~Tau and β~UMi host massive ∼ 6 MJ mass planets at about ∼1.4 au from the central star, while β~Gem is host to a 2.9 MJ mass planet at 1.7 au from the host star. We observe α~Tau and β~ UMi at two u(upgraded)GMRT bands; band~3 (250-500~MHz) and band~4 (550-900~MHz).

We also analyzed the archival observations from β Gem at 150~MHz from GMRT. We did not detect any radio signals from these systems. At 400~MHz, the 3σ upper limit is 87 μJy/beam for α~Tau~{b} and 77.4 μJy/beam for β~UMi~{b}. From our observations at 650~MHz, we place a 3σ upper limit of 28.2 μJy/beam for α~Tau~b and 33.6 μJy/beam for β~UMi~b. For β Gem b, at 150~MHz, we place an upper limit of 2.5 mJy. At 400~MHz and 650~MHz, our observations are the deepest radio images for any exoplanetary system.

Mayank Narang, P. Manoj, Ishwara Chandra, Bihan Banerjee, Himanshu Tyagi, Motohide Tamura, Thomas Henning, Blesson Mathew, Joseph Lazio, Arun Surya, Prasanta K. Nayak

Comments: 9 pages, 6 figures, accepted at MNRAS
Subjects: Earth and Planetary Astrophysics (astro-ph.EP); Solar and Stellar Astrophysics (astro-ph.SR)
Cite as: arXiv:2402.11182 [astro-ph.EP] (or arXiv:2402.11182v1 [astro-ph.EP] for this version)
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Submission history
From: Mayank Narang
[v1] Sat, 17 Feb 2024 03:46:31 UTC (1,162 KB)
Astrobiology, SETI,

Explorers Club Fellow, ex-NASA Space Station Payload manager/space biologist, Away Teams, Journalist, Lapsed climber, Synaesthete, Na’Vi-Jedi-Freman-Buddhist-mix, ASL, Devon Island and Everest Base Camp veteran, (he/him) 🖖🏻