Optical spectroscopy of Gaia detected protostars with DOT: Can we probe protostellar photospheres?

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dc.contributor.authorNarang, Mayank
dc.contributor.authorManoj, P.
dc.contributor.authorTyagi, Himanshu
dc.contributor.authorNayak, Prasanta K.
dc.contributor.authorSharma, Saurabh
dc.contributor.authorSurya, Arun
dc.contributor.authorBanerjee, Bihan
dc.contributor.authorMathew, Blesson
dc.contributor.authorGhosh, Arpan
dc.contributor.authorVerma, Aayushi
dc.date.accessioned2025-01-20T17:16:01Z
dc.date.available2025-01-20T17:16:01Z
dc.date.issued2023
dc.description.abstractOptical spectroscopy offers the most direct viewof the stellar properties and the accretion indicators. Standard accretion tracers, such as H beta, H alpha and Ca II triplet lines, and most photospheric features fall in the opticalwavelengths. However, these tracers are not readily observable from deeply embedded protostars because of the large line of sight extinction (A(v) similar to 50-100 mag) toward them. In some cases, however, it is possible to observe protostars at optical wavelengths if the outflow cavity is aligned along the line-of-sight that allows observations of the photosphere, or the envelope is very tenuous and thin, such that the extinction is low. In such cases, we not only detect these protostars at optical wavelengths, but also follow up spectroscopically. We have used the HOPS catalog (Furlan et al. in 2016) of protostars in Orion to search for optical counterparts for protostars in the Gaia DR3 survey. Out of the 330 protostars in the HOPS sample, an optical counterpart within 2 '' is detected for 62 of the protostars. For 17 out of 62 optically detected protostars, we obtained optical spectra (between 5500 and 8900 angstrom) using nt Object Spectrograph and Camera (ADFOSC) on the 3.6-m Devasthal Optical Telescope (DOT) and Hanle Faint Object Spectrograph Camera (HFOSC) on 2-m Himalayan Chandra Telescope (HCT). We detect strong photospheric features, such as the TiO bands in the spectra (of 4 protostars), hinting that photospheres can form early in the star-formation process. We further determined the spectral types of protostars, which show photospheres similar to a late M-type. Mass accretion rates derived for the protostars are similar to those found for T-Tauri stars, in the range of 10(-7)-10(-8) M-circle dot yr(-1).
dc.description.funderDepartment of Atomic Energy, Government of India
dc.fuente.origenWOS
dc.identifier.doi10.1007/s12036-023-09982-4
dc.identifier.eissn0973-7758
dc.identifier.issn0250-6335
dc.identifier.urihttps://doi.org/10.1007/s12036-023-09982-4
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/91327
dc.identifier.wosidWOS:001168573000001
dc.issue.numero2
dc.language.isoen
dc.revistaJournal of astrophysics and astronomy
dc.rightsacceso restringido
dc.subjectProtostars
dc.subjectorion
dc.subjectstar formation
dc.titleOptical spectroscopy of Gaia detected protostars with DOT: Can we probe protostellar photospheres?
dc.typeartículo
dc.volumen44
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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