2018MNRAS.474.4347C


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.22CEST17:24:37

2018MNRAS.474.4347C - Mon. Not. R. Astron. Soc., 474, 4347-4357 (2018/March-2)

The ALMA early science view of FUor/EXor objects - V. Continuum disc masses and sizes.

CIEZA L.A., RUIZ-RODRIGUEZ D., PEREZ S., CASASSUS S., WILLIAMS J.P., ZURLO A., PRINCIPE D.A., HALES A., PRIETO J.L., TOBIN J.J., ZHU Z. and MARINO S.

Abstract (from CDS):

Low-mass stars build a significant fraction of their total mass during short outbursts of enhanced accretion known as FUor and EXor outbursts. FUor objects are characterized by a sudden brightening of ∼5 mag at visible wavelengths within 1 yr and remain bright for decades. EXor objects have lower amplitude outbursts on shorter time-scales. Here we discuss a 1.3 mm Atacama Large Millimeter/submillimeter Array (ALMA) mini-survey of eight outbursting sources (three FUors, four EXors, and the borderline object V1647 Ori) in the Orion Molecular Cloud. While previous papers in this series discuss the remarkable molecular outflows observed in the three FUor objects and V1647 Ori, here we focus on the continuum data and the differences and similarities between the FUor and EXor populations. We find that FUor discs are significantly more massive (∼80-600 MJup) than the EXor objects (∼0.5-40 MJup). We also report that the EXor sources lack the prominent outflows seen in the FUor population. Even though our sample is small, the large differences in disc masses and outflow activity suggest that the two types of objects represent different evolutionary stages. The FUor sources seem to be rather compact (Rc < 20-40 au) and to have a smaller characteristic radius for a given disc mass when compared to T Tauri stars. V1118 Ori, the only known close binary system in our sample, is shown to host a disc around each one of the stellar components. The disc around HBC 494 is asymmetric, hinting at a structure in the outer disc or the presence of a second disc.

Abstract Copyright: © 2017 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): protoplanetary discs - circumstellar matter - stars: pre-main-sequence - submillimetre: stars

CDS comments: HBC 772 is a misprint for HBC 722.

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 - 2019
#notes
1 V* HL Tau TT* 04 31 38.437 +18 13 57.65   16.02 15.10 14.21   K5 1123 0
2 ASASSN -13db ev 05 10 11.08 -03 28 26.3           ~ 7 0
3 V* V1118 Ori TT* 05 34 44.745 -05 33 42.18 15.053 15.378 14.430 15.22 12.701 M1e 115 0
4 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 1906 1
5 V* NY Ori Or* 05 35 36.0089313187 -05 12 25.294778566 14.079 13.847 13.232   11.445 G6-K2e 57 0
6 V* V1143 Ori Fl* 05 38 03.8946081498 -04 16 42.858682360     17.0     ~ 54 0
7 V* V883 Ori FU* 05 38 18.0974260202 -07 02 25.963144400   14.80       F:I: 95 1
8 QSO B0537-441 BLL 05 38 50.36155219 -44 05 08.9389165   15.77 16.48 16   ~ 764 2
9 2MASS J05402745-0727300 FU* 05 40 27.450 -07 27 30.06           ~ 120 1
10 QSO B0539-057 QSO 05 41 38.08338 -05 41 49.4284     20.4 20.70   ~ 195 2
11 V* V2775 Ori FU* 05 42 48.488 -08 16 34.74           M 39 1
12 V* FU Ori FU* 05 45 22.3650208559 +09 04 12.296285806   10.72 9.60     F0Iab 686 1
13 V* V1647 Ori FU* 05 46 13.1370923766 -00 06 04.876812846     18.1     ~ 220 1
14 NAME ORI MOL CLOUD MoC 05 56 -01.8           ~ 812 1
15 HD 325367 TT* 16 03 05.4914377137 -40 18 25.426543472   11.40 8.50     M0 268 0
16 GSS 39 Y*O 16 26 45.0321556934 -24 23 07.808781522           M0 127 1
17 V* V2493 Cyg FU* 20 58 17.0282353931 +43 53 43.339695195   19.678 18.023 17.67 15.233 K0-M7 85 0

    Equat.    Gal    SGal    Ecl

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2019.10.22-17:24:37

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