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Far-Infrared Observations of the Very Low Luminosity Embedded Source L1521F-IRS in the Taurus Star-Forming Region

Terebey, Susan and Fich, Michel and Noriega-Crespo, Alberto and Padgett, Deborah L. and Fukagawa, Misato and Audard, Marc and Brooke, Tim and Carey, Sean and Evans, Neal J., II and Guedel, Manuel and Hines, Dean and Huard, Tracy and Knapp, Gillian R. and McCabe, Caer-Eve and Menard, Francois and Monin, Jean-Louis and Rebull, Luisa (2009) Far-Infrared Observations of the Very Low Luminosity Embedded Source L1521F-IRS in the Taurus Star-Forming Region. Astrophysical Journal, 696 (2). pp. 1918-1930. ISSN 0004-637X. https://resolver.caltech.edu/CaltechAUTHORS:20090902-111510802

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Abstract

We investigate the environment of the very low luminosity object L1521F-IRS using data from the Taurus Spitzer Legacy Survey. The MIPS 160 μm image shows both extended emission from the Taurus cloud and emission from multiple cold cores over a 1° × 2° region. Analysis shows that the cloud dust temperature is 14.2 ± 0.4 K and the extinction ratio is A_(160)/A_K = 0.010 ± 0.001 up to A_V ~ 4 mag. We find κ_(160) = 0.23 ± 0.046 cm^2 g^(–1) for the specific opacity of the gas-dust mixture. Therefore, for dust in the Taurus cloud we find that the 160 μm opacity is significantly higher than that measured for the diffuse interstellar medium, but not too different from dense cores, even at modest extinction values. Furthermore, the 160 μm image shows features that do not appear in the IRAS 100 μm image. We identify six regions as cold cores, i.e., colder than 14.2 K, all of which have counterparts in extinction maps or C^(18)O maps. Three of the six cores contain embedded young stellar objects, which demonstrates the cores are sites of current star formation. We compare the effects of L1521F-IRS on its natal core and find there is no evidence for dust heating at 160 or 100 μm by the embedded source. From the infrared luminosity L_(TIR) = 0.024 L_⊙ we find L_(bol_int) = 0.034 - 0.046 L_⊙, thus confirming the source's low luminosity. Comparison of L1521F-IRS with theoretical simulations for the very early phases of star formation appears to rule out the first core collapse phase. The evolutionary state appears similar to or younger than the class 0 phase, and the estimated mass is likely to be substellar.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1088/0004-637X/696/2/1918DOIArticle
http://www.iop.org/EJ/abstract/0004-637X/696/2/1918/PublisherArticle
ORCID:
AuthorORCID
Noriega-Crespo, Alberto0000-0002-6296-8960
Padgett, Deborah L.0000-0001-5334-5107
Carey, Sean0000-0002-0221-6871
Evans, Neal J., II0000-0001-5175-1777
Hines, Dean0000-0003-4653-6161
Knapp, Gillian R.0000-0002-9259-1164
Rebull, Luisa0000-0001-6381-515X
Additional Information:© 2009 The American Astronomical Society. Received 2008 June 30; accepted 2009 February 27; published 2009 April 27. This work is based in part on observations carried out by the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under NASA contract 1407. S.T. warmly thanks the Spitzer Science Center, UCLA Department of Astronomy, Caltech Department of Astronomy, and Harvard–Smithsonian Center for Astrophysics for their hospitality. M.A. acknowledges support from a Swiss National Science Foundation Professorship (PP002–110504). Facilities: SSO, IPAC (IRAS).
Group:Infrared Processing and Analysis Center (IPAC)
Funders:
Funding AgencyGrant Number
NASA1407
Swiss National Science Foundation (SNSF)PP002-110504
Subject Keywords:circumstellar matter; stars: formation; stars: individual (L1521F-IRS, L1527-IRS, IRAS 04368+2557); stars: low-mass, brown dwarfs
Issue or Number:2
Record Number:CaltechAUTHORS:20090902-111510802
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20090902-111510802
Official Citation:Far-Infrared Observations of the Very Low Luminosity Embedded Source L1521F-IRS in the Taurus Star-Forming Region Susan Terebey, Michel Fich, Alberto Noriega-Crespo, Deborah L. Padgett, Misato Fukagawa, Marc Audard, Tim Brooke, Sean Carey, Neal J. Evans, Manuel Guedel, Dean Hines, Tracy Huard, Gillian R. Knapp, Caer-Eve McCabe, Francois Menard, Jean-Louis Monin, and Luisa Rebull 2009 ApJ 696 1918-1930 doi: 10.1088/0004-637X/696/2/1918.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:15551
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:10 Sep 2009 16:33
Last Modified:31 Oct 2019 23:59

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