A uGMRT Search For Radio Emission From Planets Around Evolved Stars

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)
https://doi.org/10.48550/arXiv.2402.11182
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Submission history
From: Mayank Narang
[v1] Sat, 17 Feb 2024 03:46:31 UTC (1,162 KB)
https://arxiv.org/abs/2402.11182
Astrobiology, SETI,