2017ApJ...840L..20L


C.D.S. - SIMBAD4 rel 1.7 - 2019.11.17CET09:49:10

2017ApJ...840L..20L - Astrophys. J., 840, L20-L20 (2017/May-2)

Spectral evidence for an inner carbon-rich circumstellar belt in the young HD 36546 A-star system.

LISSE C.M., SITKO M.L., RUSSELL R.W., MARENGO M., CURRIE T., MELIS C., MITTAL T. and SONG I.

Abstract (from CDS):

Using the NASA/IRTF SpeX and BASS spectrometers we have obtained 0.7-13 µm observations of the newly imaged 3-10 Myr old HD 36546 disk system. The SpeX spectrum is most consistent with the photospheric emission expected from an L* ∼ 20 L, solar abundance A1.5V star with little to no extinction, and excess emission from circumstellar dust detectable beyond 4.5 µm. Non-detections of CO emission lines and accretion signatures point to the gas-poor circumstellar environment of a very old transition disk. Combining the SpeX + BASS spectra with archival WISE/AKARI/IRAS/Herschel photometry, we find an outer cold dust belt at ∼135 K and 20-40 au from the primary, likely coincident with the disk imaged by Subaru, and a new second inner belt with a temperature ∼570 K and an unusual, broad SED maximum in the 6-9 µm region, tracing dust at 1.1-2.2 au. An SED maximum at 6-9 µm has been reported in just two other A-star systems, HD 131488 and HD 121191, both of ∼10 Myr age. From Spitzer, we have also identified the ∼12 Myr old A7V HD 148657 system as having similar 5-35 µm excess spectral features. The Spitzer data allows us to rule out water emission and rule in carbonaceous materials-organics, carbonates, SiC-as the source of the 6-9 µm excess. Assuming a common origin for the four young A-star systems' disks, we suggest they are experiencing an early era of carbon-rich planetesimal processing.

Abstract Copyright: © 2017. The American Astronomical Society. All rights reserved.

Journal keyword(s): circumstellar matter - infrared: stars - planetary systems - radiation mechanisms: thermal - scattering - techniques: spectroscopic - techniques: spectroscopic

Simbad objects: 17

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Number of rows : 17

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 HD 15407 PM* 02 30 50.6563862358 +55 32 54.261065060   7.43 6.95     F5V 62 0
2 HD 23514 * 03 46 38.3918639443 +22 55 11.199810774 9.95 9.93 9.43 8.96 8.84 F5V 102 0
3 NAME Tau-Aur Region SFR 04 30 +25.0           ~ 1182 1
4 * alf Tau LP? 04 35 55.23907 +16 30 33.4885 4.32 2.40 0.86 -0.37 -1.31 K5+III 1168 1
5 NAME Taurus Dark Cloud SFR 04 41.0 +25 52           ~ 3322 0
6 * 18 Ori * 05 16 04.1347256778 +11 20 28.878981087   5.500 5.515     A0V 52 0
7 HD 36546 * 05 33 30.7588128726 +24 37 43.731535630   7.02 6.95   6.90 B8 28 0
8 * bet Pic PM* 05 47 17.0876901 -51 03 59.441135 4.13 4.03 3.86 3.74 3.58 A6V 1602 1
9 * alf CMa SB* 06 45 08.91728 -16 42 58.0171 -1.51 -1.46 -1.46 -1.46 -1.43 A1V+DA 1374 0
10 HD 109573 PM* 12 36 01.0317721349 -39 52 10.222698506   5.786 5.774 7.25 5.81 A0V 537 1
11 HD 113766 ** 13 06 35.83622 -46 02 02.0178   7.91 7.56     F3/5V 91 1
12 HD 121191 * 13 55 18.8788456136 -53 31 42.713405012   8.40 8.16     A5IV/V 18 0
13 HD 131499 * 14 54 12.3947651267 -10 49 09.189043886   11.113 10.729     F0/2V 5 0
14 HD 131488 * 14 55 08.0285082411 -41 07 13.401062817   8.09 8.00     A1V 15 0
15 HD 148657 *iN 16 31 11.6732761741 -38 22 58.749748472   8.81 8.55     A0V 22 1
16 * c Oph Be* 17 31 24.9541340 -23 57 45.513592 4.75 4.81 4.81 4.74 4.72 A0V 250 0
17 HD 172555 PM* 18 45 26.9004853 -64 52 16.539796   4.967 4.767     A7V 225 0

    Equat.    Gal    SGal    Ecl

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2019.11.17-09:49:10

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