ItemArticle

A Novel Survey for Young Substellar Objects with the W-band Filter. VI. Spectroscopic Census of Substellar Members and the IMF of the ? Orionis Cluster

Title
A Novel Survey for Young Substellar Objects with the W-band Filter. VI. Spectroscopic Census of Substellar Members and the IMF of the ? Orionis Cluster
Creator
Damian B.; Jose J.; Biller B.; Herczeg G.J.; Albert L.; Allers K.; Zhang Z.; Liu M.C.; Dubber S.; Paul K.; Chen W.-P.; Lalchand B.; Sharma T.; Oasa Y.
Description
Low-mass stars and substellar objects are essential in tracing the initial mass function (IMF). We study the nearby young ? Orionis cluster (d ? 408 pc, age ? 1.8 Myr) using deep near-infrared (NIR) photometric data in the J, W, and H bands from WIRCam on the Canada-France-Hawaii Telescope. We use the water absorption feature to select brown dwarfs photometrically and confirm their nature spectroscopically with IRTF-SpeX. Additionally we select candidate low-mass stars for spectroscopy and analyze their membership and those of literature sources using astrometry from Gaia DR3. We obtain NIR spectra for 28 very-low-mass stars and brown dwarfs and estimate their spectral type between M3 and M8.5 (masses ranging between 0.3 and 0.01 M ?). Apart from these, we also identify five new planetary-mass candidates which require further spectroscopic confirmation of youth. We compile a comprehensive catalog of 170 spectroscopically confirmed members in the central region of the cluster, for a wide mass range of ?19-0.004 M ?. We estimate the star-to-brown-dwarf ratio to be ?4, within the range reported for other nearby star-forming regions. With the updated catalog of members we trace the IMF down to 4 M Jup and we find that a two-segment power law fits the substellar IMF better than a log-normal distribution. 2023. The Author(s). Published by the American Astronomical Society.
Source
Astrophysical Journal, Vol-951, No. 2
Date
2023-01-01
Publisher
Institute of Physics
Coverage
Damian B., Department of Physics and Electronics, CHRIST (Deemed to be University, Hosur Road, Bengaluru, 560029, India; Jose J., Indian Institute of Science Education and Research (IISER) Tirupati, Rami Reddy Nagar, Karakambadi Road, Mangalam (P.O.), Tirupati, 517507, India; Biller B., SUPA, Institute for Astronomy, University of Edinburgh, Blackford Hill, Edinburgh, EH9 3HJ, United Kingdom, Centre for Exoplanet Science, University of Edinburgh, Edinburgh, United Kingdom; Herczeg G.J., Kavli Institute for Astronomy and Astrophysics, Peking University, Yiheyuan 5, Haidian Qu, Beijing, 100871, China, Department of Astronomy, Peking University, Yiheyuan 5, Haidian Qu, Beijing, 100871, China; Albert L., Institut de Recherche sur les Exoplanes (iREx), Universitde Montrl, Dartement de Physique, C.P. 6128 Succ. Centre-ville, Montrl, H3C 3J7, QC, Canada; Allers K., Department of Physics and Astronomy, Bucknell University, Lewisburg, 17837, PA, United States; Zhang Z., Department of Astronomy & Astrophysics, University of California, Santa Cruz, 1156 High St, Santa Cruz, 95064, CA, United States; Liu M.C., Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, 96822, HI, United States; Dubber S., SUPA, Institute for Astronomy, University of Edinburgh, Blackford Hill, Edinburgh, EH9 3HJ, United Kingdom, Centre for Exoplanet Science, University of Edinburgh, Edinburgh, United Kingdom; Paul K., Department of Physics and Electronics, CHRIST (Deemed to be University, Hosur Road, Bengaluru, 560029, India; Chen W.-P., Institute of Astronomy, National Central University, 300 Zhongda Road, Zhongli, Taoyuan, 32001, Taiwan, Department of Physics, National Central University, 300 Zhongda Road, Zhongli, Taoyuan, 32001, Taiwan; Lalchand B., Institute of Astronomy, National Central University, 300 Zhongda Road, Zhongli, Taoyuan, 32001, Taiwan; Sharma T., Institute of Astronomy, National Central University, 300 Zhongda Road, Zhongli, Taoyuan, 32001, Taiwan; Oasa Y., Faculty of Education, Graduate School of Science and Engineering, Saitama University, 255 Shimo-Okubo, Sakura-ku, Saitama, 338-8570, Japan
Rights
All Open Access; Gold Open Access; Green Open Access
Relation
ISSN: 0004637X
Format
Online
Language
English
Type
Article

Collection

Articles

Citation

Damian B.; Jose J.; Biller B.; Herczeg G.J.; Albert L.; Allers K.; Zhang Z.; Liu M.C.; Dubber S.; Paul K.; Chen W.-P.; Lalchand B.; Sharma T.; Oasa Y., “A Novel Survey for Young Substellar Objects with the W-band Filter. VI. Spectroscopic Census of Substellar Members and the IMF of the ? Orionis Cluster,” CHRIST (Deemed To Be University) Institutional Repository, accessed November 4, 2025, https://archives.christuniversity.in/items/show/14146.

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