Photometric Variability of Low Mass Stars and Brown Dwarfs in IC~348 and Taurus Star-Forming Regions
Fuente:
arXiv
Saved in:
| Main Authors: | , , , , |
|---|---|
| Format: | Preprint |
| Published: |
2024
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866916091911995392 |
|---|---|
| author | Ghosh, Samrat Mondal, Soumen Joshi, Santosh Lata, Sneh Kumbhakar, Rajib |
| author_facet | Ghosh, Samrat Mondal, Soumen Joshi, Santosh Lata, Sneh Kumbhakar, Rajib |
| contents | Low-mass stars belonging to the M spectral type are the most numerous stars in our Galaxy, amounting to about two-thirds in number, and are found at the bottom of the main sequence in the H-R diagram. %Multi-wavelength studies on star-forming regions help to understand the census of PMS stars, their formation process, and the interaction of expanding H II regions harboring massive stars with their natal molecular clouds. Photometric studies of low-mass stars, including brown dwarfs (BDs), provide several important evolutions of their atmosphere, magnetic flares and chromospheric activity. This paper highlights a few interesting results from our optical I-band observations of 2MASS J03435638+3209591 in the young star-forming IC~348 region and three BDs in Taurus star-forming regions using ground-based telescopes as well as a space-based telescope. We estimated the fast periodicities in the range of 1.5 to 3 hours in Taurus BDs. Furthermore, using the long-term photometry from the Transiting Exoplanet Survey Satellite (TESS), we have conducted a time-resolved variability analysis of CFHT-BD-Tau 4. The periodogram analysis of TESS data reveals an orbital period of $\sim$ 3 days. We found two flare events in TESS sector 43 data for this BD and estimated the flared energies as $4.59\times10^{35}$ erg and $2.64\times10^{36}$ erg, which sit in the superflare range. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2401_07609 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Photometric Variability of Low Mass Stars and Brown Dwarfs in IC~348 and Taurus Star-Forming Regions Ghosh, Samrat Mondal, Soumen Joshi, Santosh Lata, Sneh Kumbhakar, Rajib Solar and Stellar Astrophysics Low-mass stars belonging to the M spectral type are the most numerous stars in our Galaxy, amounting to about two-thirds in number, and are found at the bottom of the main sequence in the H-R diagram. %Multi-wavelength studies on star-forming regions help to understand the census of PMS stars, their formation process, and the interaction of expanding H II regions harboring massive stars with their natal molecular clouds. Photometric studies of low-mass stars, including brown dwarfs (BDs), provide several important evolutions of their atmosphere, magnetic flares and chromospheric activity. This paper highlights a few interesting results from our optical I-band observations of 2MASS J03435638+3209591 in the young star-forming IC~348 region and three BDs in Taurus star-forming regions using ground-based telescopes as well as a space-based telescope. We estimated the fast periodicities in the range of 1.5 to 3 hours in Taurus BDs. Furthermore, using the long-term photometry from the Transiting Exoplanet Survey Satellite (TESS), we have conducted a time-resolved variability analysis of CFHT-BD-Tau 4. The periodogram analysis of TESS data reveals an orbital period of $\sim$ 3 days. We found two flare events in TESS sector 43 data for this BD and estimated the flared energies as $4.59\times10^{35}$ erg and $2.64\times10^{36}$ erg, which sit in the superflare range. |
| title | Photometric Variability of Low Mass Stars and Brown Dwarfs in IC~348 and Taurus Star-Forming Regions |
| topic | Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2401.07609 |