A5069642381- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Astro and Planetary Science
- Astrophysical Phenomena and Observations
- Molecular Spectroscopy and Structure
National Central University
2021-2023
Abstract We present the four-year survey results of monthly submillimeter monitoring eight nearby (<500 pc) star-forming regions by JCMT Transient Survey. apply Lomb–Scargle Periodogram technique to search for and characterize variability on 295 peaks brighter than 0.14 Jy beam −1 , including 22 disk sources (Class II), 83 protostars 0/I), 190 starless sources. uncover 18 secular variables, all them protostars. No single-epoch burst or drop events no inherently stochastic are observed....
Abstract We present a study of very low mass stars and brown dwarfs in the rich star-forming core ρ Ophiuchi cloud complex. The selection sample relies on detecting inherent water absorption characteristic young substellar objects. Of 22 water-bearing candidates selected, 15 have spectral type M6 or later. Brown dwarf too faint for membership determination by Gaia their proper motions derived deep-infrared images spanning 6 yr. Astrometric analysis confirms 21/22 sources as members, with one...
Abstract Low-mass stars and substellar objects are essential in tracing the initial mass function (IMF). We study nearby young σ Orionis cluster ( d ∼ 408 pc, age 1.8 Myr) using deep near-infrared (NIR) photometric data J , W H bands from WIRCam on Canada–France–Hawaii Telescope. use water absorption feature to select brown dwarfs photometrically confirm their nature spectroscopically with IRTF-SpeX. Additionally we candidate low-mass for spectroscopy analyze membership those of literature...
We report the discovery of substellar objects in young star cluster IC 348 and neighboring Barnard 5 dark cloud, both at eastern end Perseus star-forming complex. The candidates are selected using narrowband imaging, i.e., on off photometric technique with a filter centered around water absorption feature 1.45 microns, proven to be efficient detecting water-bearing objects. Our spectroscopic observations confirm three brown dwarfs 348. In addition, source WBIS 03492858+3258064, reported this...
We present CFHT photometry and IRTF spectroscopy of low-mass candidate members Serpens South Core ($\sim$430 pc, $\sim$0.5 Myr), identified using a novel combination photometric filters, known as the W-band method. report SC182952+011618, SS182959-020335 SS183032-021028 young, members, with spectral types in range M7-M8, M5-L0 M5-M6.5 respectively. Best-fit effective temperatures luminosities imply masses $
ABSTRACT We present spectroscopic confirmation of nine M5 or later Serpens Core candidate members, identified using a combination CFHT WIRCam photometry and IRTF SpeX spectroscopy. Through spectral fitting, we find that the latest these members is best fit by an L0 standard (in range M8–L2), implying mass ∼0.01–0.035M⊙. If confirmed as cluster member, this would be one lowest objects ever discovered. analysis physical properties sample, well likely membership members.
Abstract Stars are formed by gravitational collapse, spontaneously or, in some cases under the constructive influence of nearby massive stars, out molecular cloud cores. Here we present an observational diagnosis such triggered formation processes prominent H ii region Sh 2-142, which is associated with young star cluster NGC 7380, and bright-rimmed clouds as signpost photoionization surfaces. Using near- (2MASS) mid-infrared (WISE) colors, identified candidate stars at different...
We present a study of very low-mass stars and brown dwarfs in the rich star-forming core Rho Ophiuchi cloud complex. The selection sample relies on detecting inherent water absorption characteristic young substellar objects. Of 22 water-bearing candidates selected, 15 have spectral type M6 or later. Brown dwarf too faint for membership determination by Gaia their proper motions derived deep-infrared images spanning six years. Astrometric analysis confirms 21/22 sources as members, one...