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- W2085594810 abstract "view Abstract Citations (6) References (32) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Upper Limits to the Detection of Ammonia from Protoplanetary Disks around HL Tauri and L1551-IRS 5 Gomez, Jose F. ; Torrelles, Jose M. ; Ho, Paul T. P. ; Rodriguez, Luis F. ; Canto, Jorge Abstract We present NH3(1, 1) and (2, 2) observations of the young stellar sources HL Tau and L1551-IRS 5 using the VLA in its B-configuration, which provides an angular resolution of about 0.4 arcsec (about 50 AU at 140 pc) at 1.3 cm wavelength. Our goal was to detect and resolve circumstellar molecular disks with radius of the order of 100 AU around these two sources. No ammonia emission was detected toward either of them. The 3-sigma levels were 2.7 mJy/beam and 3.9 mJy/beam for HL Tau and L1551-IRS 5, respectively, with a velocity resolution of about 5 km/s. With this nondetection, we estimate upper limits to the mass of the proposed protoplanetary molecular disks (within a radius of 10 AU from the central stars) on the order of 0.02/(X(NH3)/10 exp -8) solar mass for HL Tau and 0.1/(X(NH3)/10 exp -8) solar mass for L1551-IRS 5. Publication: The Astrophysical Journal Pub Date: September 1993 DOI: 10.1086/173079 Bibcode: 1993ApJ...414..333G Keywords: Ammonia; Early Stars; Pre-Main Sequence Stars; Protoplanets; Stellar Envelopes; Taurus Constellation; Angular Resolution; Planetary Systems; Very Large Array (Vla); Astrophysics; STARS: CIRCUMSTELLAR MATTER; STARS: INDIVIDUAL CONSTELLATION NAME: HL TAURI; STARS: INDIVIDUAL ALPHANUMERIC: L1551 IRS 5; STARS: PRE--MAIN-SEQUENCE full text sources ADS | data products SIMBAD (4)" @default.
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- W2085594810 date "1993-09-01" @default.
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- W2085594810 title "Upper limits to the detection of ammonia from protoplanetary disks around HL Tauri and L1551-IRS 5" @default.
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