Dynamic Photometric Variability in Three Young Brown Dwarfs in Taurus: Detection of Optical Flares with TESS Data
We present I -band time-series photometric variability studies of three known nearby (∼140 pc) and young (∼1 Myr) brown dwarfs (BD) in the Taurus star-forming region in the Perseus molecular cloud. From 10 nights of observations over a time span of 10 yr, with a typical run of 3–6 hr each night, we...
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2025-01-01
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| Online Access: | https://doi.org/10.3847/1538-4357/ada955 |
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| author | Samrat Ghosh Soumen Mondal Somnath Dutta Rajib Kumbhakar Ramkrishna Das Santosh Joshi Sneh Lata |
| author_facet | Samrat Ghosh Soumen Mondal Somnath Dutta Rajib Kumbhakar Ramkrishna Das Santosh Joshi Sneh Lata |
| author_sort | Samrat Ghosh |
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| description | We present I -band time-series photometric variability studies of three known nearby (∼140 pc) and young (∼1 Myr) brown dwarfs (BD) in the Taurus star-forming region in the Perseus molecular cloud. From 10 nights of observations over a time span of 10 yr, with a typical run of 3–6 hr each night, we estimated that the BDs show unstable short-scale periodicity from 1.5 to 4.8 hr. Using the long-term photometry from the Transiting Exoplanet Survey Satellite (TESS), we have conducted a time-resolved variability analysis of CFHT-BD-Tau 3 and CFHT-BD-Tau 4, revealing orbital periods of ∼0.96 days and ∼3 days respectively, consistent with earlier studies. We also found two superflares in TESS sector 43 data for CFHT-BD-Tau 4 and estimated the flare energies as 7.09 × 10 ^35 erg and 3.75 × 10 ^36 erg. A magnetic field of ∼3.39 kG is required to generate such flare energies on this BD. We performed spot modeling analysis on CFHT-BD-Tau 3 and CFHT-BD-Tau 4 to address the variability detected in the data using the package BASSMAN. Spectral energy distribution and infrared colors of the sources suggest that they have a sufficient amount of circumstellar material around them. |
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| language | English |
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| spelling | doaj-art-2e4f1ed7fae24d36866248dbc93f31e72025-08-20T03:12:50ZengIOP PublishingThe Astrophysical Journal1538-43572025-01-0198117510.3847/1538-4357/ada955Dynamic Photometric Variability in Three Young Brown Dwarfs in Taurus: Detection of Optical Flares with TESS DataSamrat Ghosh0https://orcid.org/0000-0003-3354-850XSoumen Mondal1https://orcid.org/0000-0003-1457-0541Somnath Dutta2https://orcid.org/0000-0002-2338-4583Rajib Kumbhakar3https://orcid.org/0000-0001-7277-2577Ramkrishna Das4https://orcid.org/0000-0002-5440-7186Santosh Joshi5https://orcid.org/0009-0007-1545-854XSneh Lata6https://orcid.org/0000-0001-9367-1580Aryabhatta Research Institute of Observational Sciences (ARIES) , Manora Peak, Nainital-263002, India; S. N. Bose National Centre for Basic Sciences , Salt Lake, Kolkata 700 106, IndiaS. N. Bose National Centre for Basic Sciences , Salt Lake, Kolkata 700 106, IndiaInstitute of Astronomy and Astrophysics , Academia Sinica, Taipei 10617, TaiwanS. N. Bose National Centre for Basic Sciences , Salt Lake, Kolkata 700 106, IndiaS. N. Bose National Centre for Basic Sciences , Salt Lake, Kolkata 700 106, IndiaAryabhatta Research Institute of Observational Sciences (ARIES) , Manora Peak, Nainital-263002, IndiaAryabhatta Research Institute of Observational Sciences (ARIES) , Manora Peak, Nainital-263002, IndiaWe present I -band time-series photometric variability studies of three known nearby (∼140 pc) and young (∼1 Myr) brown dwarfs (BD) in the Taurus star-forming region in the Perseus molecular cloud. From 10 nights of observations over a time span of 10 yr, with a typical run of 3–6 hr each night, we estimated that the BDs show unstable short-scale periodicity from 1.5 to 4.8 hr. Using the long-term photometry from the Transiting Exoplanet Survey Satellite (TESS), we have conducted a time-resolved variability analysis of CFHT-BD-Tau 3 and CFHT-BD-Tau 4, revealing orbital periods of ∼0.96 days and ∼3 days respectively, consistent with earlier studies. We also found two superflares in TESS sector 43 data for CFHT-BD-Tau 4 and estimated the flare energies as 7.09 × 10 ^35 erg and 3.75 × 10 ^36 erg. A magnetic field of ∼3.39 kG is required to generate such flare energies on this BD. We performed spot modeling analysis on CFHT-BD-Tau 3 and CFHT-BD-Tau 4 to address the variability detected in the data using the package BASSMAN. Spectral energy distribution and infrared colors of the sources suggest that they have a sufficient amount of circumstellar material around them.https://doi.org/10.3847/1538-4357/ada955Brown dwarfsLow mass starsOptical flaresAtmospheric variabilityVariable starsStellar activity |
| spellingShingle | Samrat Ghosh Soumen Mondal Somnath Dutta Rajib Kumbhakar Ramkrishna Das Santosh Joshi Sneh Lata Dynamic Photometric Variability in Three Young Brown Dwarfs in Taurus: Detection of Optical Flares with TESS Data The Astrophysical Journal Brown dwarfs Low mass stars Optical flares Atmospheric variability Variable stars Stellar activity |
| title | Dynamic Photometric Variability in Three Young Brown Dwarfs in Taurus: Detection of Optical Flares with TESS Data |
| title_full | Dynamic Photometric Variability in Three Young Brown Dwarfs in Taurus: Detection of Optical Flares with TESS Data |
| title_fullStr | Dynamic Photometric Variability in Three Young Brown Dwarfs in Taurus: Detection of Optical Flares with TESS Data |
| title_full_unstemmed | Dynamic Photometric Variability in Three Young Brown Dwarfs in Taurus: Detection of Optical Flares with TESS Data |
| title_short | Dynamic Photometric Variability in Three Young Brown Dwarfs in Taurus: Detection of Optical Flares with TESS Data |
| title_sort | dynamic photometric variability in three young brown dwarfs in taurus detection of optical flares with tess data |
| topic | Brown dwarfs Low mass stars Optical flares Atmospheric variability Variable stars Stellar activity |
| url | https://doi.org/10.3847/1538-4357/ada955 |
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