2012A&A...539A..81G


C.D.S. - SIMBAD4 rel 1.7 - 2019.07.22CEST13:01:16

2012A&A...539A..81G - Astronomy and Astrophysics, volume 539A, 81-81 (2012/3-1)

Warm gas at 50 AU in the disk around Herbig Be star HD 100546.

GOTO M., VAN DER PLAS G., VAN DEN ANCKER M., DULLEMOND C.P., CARMONA A., HENNING T., MEEUS G., LINZ H. and STECKLUM B.

Abstract (from CDS):

The disk atmosphere is one of the fundamental elements of theoretical models of a protoplanetary disk. However, the direct observation of the warm gas (≫100K) at large radius of a disk (≫10AU) is challenging, because the line emission from warm gas in a disk is usually dominated by the emission from an inner disk. Our goal is to detect the warm gas in the disk atmosphere well beyond 10AU from a central star in a nearby disk system of the Herbig Be star HD 100546. We measured the excitation temperature of the vibrational transition of CO at incremental radii of the disk from the central star up to 50AU, using an adaptive optics system combined with the high-resolution infrared spectrograph CRIRES at the VLT. The observation successfully resolved the line emission with 0.1" angular resolution, which is 10AU at the distance of HD 100546. Population diagrams were constructed at each location of the disk, and compared with the models calculated taking into account the optical depth effect in LTE condition. The excitation temperature of CO is 400-500K or higher at 50AU away from the star, where the blackbody temperature in equilibrium with the stellar radiation drops as low as 90K. This is unambiguous evidence of a warm disk atmosphere far away from the central star.

Abstract Copyright:

Journal keyword(s): circumstellar matter - stars: pre-main sequence - protoplanetary disks - stars: individual: HD 100546 - stars: variables: T Tauri, Herbig Ae, Be - stars: formation

Simbad objects: 2

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Number of rows : 2

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 HD 100546 Be* 11 33 25.4404858122 -70 11 41.239343121   6.71 6.30   6.64 A0VaekB8_lB 603 1
2 * alf Oph ** 17 34 56.06945 +12 33 36.1346 2.32 2.22 2.07 1.93 1.85 A5IVnn 434 0

    Equat.    Gal    SGal    Ecl

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2019.07.22-13:01:16

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