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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



ID: 709883.0, MPI für Astronomie / Publikationen_mpia
HOPS 136: An edge-on Orion protostar near the end of envelope infall
Authors:Fischer, W. J.; Megeath, S. T.; Tobin, J. J.; Hartmann, L.; Stutz, A. M.; Kounkel, M.; Poteet, C. A.; Ali, B.; Osorio, M.; Manoj, P.; Remming, I.; Stanke, T.; Watson, D. M.
Date of Publication (YYYY-MM-DD):2014
Title of Journal:The Astrophysical Journal
Volume:781
Issue / Number:2
Start Page:id. 123 (11 pp)
Audience:Not Specified
Abstract / Description:Edge-on protostars are valuable for understanding the disk and envelope properties of embedded young stellar objects, since the disk, envelope, and envelope cavities are all distinctly visible in resolved images and well constrained in modeling. Comparing Two Micron All Sky Survey, Wide-field Infrared Survey Explorer, Spitzer, Herschel, and APEX photometry and an IRAM limit from 1.2 to 1200 mum, Spitzer spectroscopy from 5 to 40 mum, and high-resolution Hubble imaging at 1.60 and 2.05 mum to radiative transfer modeling, we determine envelope and disk properties for the Class I protostar HOPS 136, an edge-on source in Orion's Lynds 1641 region. The source has a bolometric luminosity of 0.8 L &sun;, a bolometric temperature of 170 K, and a ratio of submillimeter to bolometric luminosity of 0.8%. Via modeling, we find a total luminosity of 4.7 L &sun; (larger than the observed luminosity due to extinction by the disk), an envelope mass of 0.06 M &sun;, and a disk radius and mass of 450 AU and 0.002 M &sun;. The stellar mass is highly uncertain but is estimated to fall between 0.4 and 0.5 M &sun;. To reproduce the flux and wavelength of the near-infrared scattered-light peak in the spectral energy distribution, we require 5.4 × 10-5 M &sun; of gas and dust in each cavity. The disk has a large radius and a mass typical of more evolved T Tauri disks in spite of the significant remaining envelope. HOPS 136 appears to be a key link between the protostellar and optically revealed stages of star formation.
Free Keywords:circumstellar matter; infrared: stars; stars: formation; stars: protostars
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:ISSN:0004-637X %R 10.1088/0004-637X/781/2/123
URL:http://cdsads.u-strasbg.fr/abs/2014ApJ...781..123F
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