| Name: | Ayanabha De |
| Affiliation: | Tata Institute of Fundamental Research, Mumbai |
| Conference ID : | ASI2024_542 |
| Title : | Characterising the radio sources in the solar neighbourhood: a VLASS-GAIA DR3 study |
| Authors : | Ayanabha De 1, Mayank Narang 2, Manoj Puravankara 1, Shridharan Baskaran 3, Himanshu Tyagi 1 |
| Authors Affiliation: | 1) Tata Institute of Fundamental Research, Mumbai - 400005, India
2) The Academia Sinica Institute of Astronomy and Astrophysics, Taipei - 10617, Taiwan
3) Department of Physics and Electronics, CHRIST(deemed to be University), Bangalore - 560029, India |
| Mode of Presentation: | Poster |
| Abstract Category : | Stars, Interstellar Medium, and Astrochemistry in Milky Way |
| Abstract : | With the release of Very Large Array Sky Survey (VLASS) data, we now have access to the radio sky at 3 GHz frequency and its variability over two epochs. We cross-matched the VLASS quick look catalogue with GAIA DR3 to obtain the optical counterparts of the radio sources within 350pc. By analysing how the radio brightness temperature of the sources varies with their spectral type, we have associated possible emission mechanisms with different object types. A possible correlation between quiescent radio and X-ray/ UV emission has been studied for our sample. Such a correlation can provide crucial insights into the current understanding of the Gudel-Benz relationship, which is essential for modelling steady radio emission and coronal heating. We have identified distinct populations of 3 GHz emitters across the HR diagram. There are a few B, A and early F-type stars, a large number of binaries, sub-giants, Herbig Ae/Be stars, protostars and T-Tauris, which show up in our sample. A large chunk of the sample is constituted by F, G, K and early M-type stars, most probably emitting due to chromospheric activity. Surprisingly, we see a lack of late M types and Brown Dwarfs in our sample. Pinning down the origin of radio emission from these populations can help us gain further insights into the origin of stellar and planetary magnetic fields, accretion dynamics in T-Tauris and the formation of stars. Studying stellar flares in detail is crucial to detect star-planet interactions (SPIs) confidently. Our analysis of VLASS catalogue will provide a basis for many interesting follow-up observations at multiple wavelengths to better understand stellar structure and detect SPIs. |
