2019A&A...629A.108A


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.21CEST16:14:49

2019A&A...629A.108A - Astronomy and Astrophysics, volume 629A, 108-108 (2019/9-1)

HST spectra reveal accretion in MY Lupi.

ALCALA J.M., MANARA C.F., FRANCE K., SCHNEIDER C.P., ARULANANTHAM N., MIOTELLO A., GUNTHER H.M. and BROWN A.

Abstract (from CDS):

The mass accretion rate is a crucial parameter for the study of the evolution of accretion discs around young low-mass stellar and substellar objects (YSOs). We revisit the case of MY Lup, an object where VLT/X-shooter data suggested a negligible mass accretion rate, and show it to be accreting on a level similar to other Class II YSOs in Lupus based on Hubble Space Telescope (HST) observations. In our HST-Cosmic Origins Spectrograph (HST-COS) and -Space Telescope Imaging Spectrograph (HST-STIS) spectra, we find many emission lines, as well as substantial far-ultraviolet (FUV) continuum excess emission, which can be ascribed to active accretion. The total luminosity of the CIVλ1549 Å doublet is 4.1x10–4L. Using scalings between accretion luminosity, Lacc, and CIV luminosity from the literature, we derive Lacc∼2x10–1L, which is more than an order of magnitude higher than the upper limit estimated from the X-shooter observations. We discuss possible reasons for the X-shooter-HST discrepancy, the most plausible being that the low contrast between the continuum excess emission and the photospheric+chromospheric emission at optical wavelengths in MY Lup hampered detection of excess emission. The luminosity of the FUV continuum and CIV lines, strong H2 fluorescence, and a "1600 A Bump" place MY Lup in the class of accreting objects with gas-rich discs. So far, MY Lup is the only peculiar case in which a significant difference between the HST and X-shooter Macc estimates exists that is not ascribable to variability. The mass accretion rate inferred from the revisited Lacc estimate is Macc∼1(–0.5+1.5)x10–8M/yr. This value is consistent with the typical value derived for accreting YSOs of similar mass in Lupus and points to less clearing of the inner disc than indicated by near- and mid-infrared observations. This is confirmed by Atacama Large Millimeter Array (ALMA) data, which show that the gaps and rings seen in the sub-millimetre are relatively shallow.

Abstract Copyright: © ESO 2019

Journal keyword(s): stars: pre-main sequence - stars: low-mass - accretion, accretion disks - stars: individual: MY Lupi - protoplanetary disks

Simbad objects: 92

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Number of rows : 92

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 V* IP Tau Or* 04 24 57.0823478325 +27 11 56.543062579   14.50   12.46   M0:Ve 192 0
2 V* V1077 Tau Or* 04 34 18.0134345949 +18 30 06.335688396   13.70       G8 74 0
3 V* AA Tau Or* 04 34 55.4222683130 +24 28 53.038273587 13.14 13.34 12.20     K5Ve 635 0
4 HD 282630 Or* 04 55 36.9698052301 +30 17 55.100440086   12.17 11.12 10.55   K0Ve 151 0
5 V* RW Aur TT* 05 07 49.5662483 +30 24 05.177426   10.86 9.60 9.95   K1/5e+K5e 717 0
6 CVSO 224 TT* 05 25 46.7558569125 +01 43 30.293019729     17.21 16.19 14.61 M3.5Ve 22 0
7 V* V354 Mon TT* 06 41 00.5099718638 +09 29 15.957184805 16.81 15.94 14.73 14.04 13.34 K4e 44 0
8 NAME Cha I MoC 11 06 48 -77 18.0           ~ 985 1
9 V* T Cha Or* 11 57 13.5268556629 -79 21 31.521755129   10.00 11.86     K0e 236 1
10 Sz 65 Or* 15 39 27.7717320499 -34 46 17.209059896   13.11 12.13 11.33 10.76 K7 73 0
11 Sz 66 TT* 15 39 28.2834975101 -34 46 18.086529821   14.9   14.51 12.56 M2 41 0
12 2MASS J15414081-3345188 Y*O 15 41 40.8089583953 -33 45 18.862191968         17.38 M6.5 14 0
13 2MASS J15445789-3423392 Y*O 15 44 57.8923724839 -34 23 39.364812934   18.38 17.74 17.29 15.28 M5.0e 25 0
14 2MASS J15450887-3417333 Y*O 15 45 08.8747567515 -34 17 33.460978147       18.73   M5.5 30 0
15 CD-33 10685 Or* 15 45 12.8670160092 -34 17 30.646921079 12.47 11.56 10.224 9.60 8.685 K3Ve 221 1
16 V* HW Lup Or* 15 45 17.4119603565 -34 18 28.293017151   17.41 16.25     M1 53 0
17 2MASS J15451851-3421246 Y*O 15 45 18.5160162909 -34 21 24.564123500   17.95   17.35   M6.5 14 0
18 V* GW Lup Or* 15 46 44.7292759994 -34 30 35.677245389   13.8       M1.5e 86 0
19 V* HM Lup Or* 15 47 50.6290613485 -35 28 35.404500425   15.96       M3e 62 0
20 THA 15-5 TT* 15 47 56.9433443193 -35 14 34.797849332   14.5 16.2     K7e 64 0
21 V* HN Lup Or* 15 48 05.2154956876 -35 15 53.295162846           M3.5e 49 0
22 CD-35 10525 Or* 15 49 12.1055573607 -35 39 05.053991067 12.19 12.76 11.66 11.15   K7Ve 240 0
23 Sz 76 TT* 15 49 30.7354526514 -35 49 51.418314548   14.4       M3.2 34 0
24 Sz 77 TT* 15 51 46.9579216483 -35 56 44.112995611   12.0       K5.5 53 0
25 NAME THA 15-10A Y*O 15 55 50.2817116421 -38 01 33.696904246           M4.5 6 0
26 NAME THA 15-10B Y*O 15 55 50.3364022290 -38 01 31.865473844           M5.5 4 0
27 WRAY 15-1384 TT* 15 56 02.0991789524 -36 55 28.274442471 14.91 15.05 13.85 12.91 11.86 M1 29 0
28 THA 15-12 Or* 15 56 09.2067120748 -37 56 06.126159332   13.12 11.93 11.45   M0e 256 0
29 V* RU Lup Or* 15 56 42.3109948086 -37 49 15.473469159 9.27 10.07 9.60     K7/M0e 389 0
30 Sz 84 TT* 15 58 02.5212129160 -37 36 02.733294310   14.3       M5.0e 52 0
31 WRAY 15-1400 TT* 15 59 16.4714616661 -41 57 10.300292528   13.5 12.0     K7IVe 61 0
32 2MASS J15592523-4235066 Y*O 15 59 25.2348817583 -42 35 06.574333595   17.42 16.82     M5 16 0
33 V* RY Lup Or* 15 59 28.3852522995 -40 21 51.255321659   12.62 9.90     G8/K1IV-V 170 0
34 2MASS J16000060-4221567 Y*O 16 00 00.6025556934 -42 21 56.821022044   17.29 15.85 15.25 13.43 M4.5 24 0
35 2MASS J16000236-4222145 Y*O 16 00 02.3596641694 -42 22 14.595263750   16.86 15.46 14.98 13.59 M4 29 0
36 2MASS J16002612-4153553 Y*O 16 00 26.1203643851 -41 53 55.381248967   16.57 16.45 15.70 13.80 M5.25 24 0
37 Sz 130 TT* 16 00 31.0374928462 -41 43 36.991093739   15.82 14.71 13.56 12.46 M1.5 44 0
38 V* MY Lup TT* 16 00 44.5199369001 -41 55 30.931594414   12.64 12.17 11.06   K0 62 0
39 Sz 131 Y*O 16 00 49.4334861658 -41 30 03.918935711   17.51 16.13 14.60 12.92 M2 28 0
40 HD 325367 Or* 16 03 05.4914377137 -40 18 25.426543472   11.40 8.50     M0 282 0
41 NAME Lupus IV MoC 16 03 12.4 -42 07 43           ~ 125 0
42 Sz 133 Y*O 16 03 29.3676884922 -41 40 01.858389664   17.77 16.60 15.78 15.04 K2 34 0
43 V* HO Lup A Y*O 16 07 00.5996246992 -39 02 19.517159959           M0 7 0
44 V* HO Lup B Y*O 16 07 00.6750793403 -39 02 18.258247935           M4.5 6 0
45 2MASS J16070384-3911113 Y*O 16 07 03.8309506752 -39 11 11.679148554       18.79 16.80 M4.5 29 0
46 THA 15-21 TT* 16 07 10.0693512723 -39 11 03.258471635   15.28 13.70 13.70 12.49 K7-M0 54 0
47 THA 15-20 TT* 16 07 11.5876160594 -39 03 47.490881982   16.25 14.58 14.11 12.92 M0.5 76 0
48 2MASS J16073773-3921388 Y*O 16 07 37.7338427461 -39 21 38.749993258   18.38 17.4 17.12 15.68 M5.5e 32 0
49 Sz 95 TT* 16 07 52.3113021630 -38 58 06.092190897   16.39 14.57 14.25 12.53 ~ 39 0
50 2MASS J16080017-3902595 Y*O 16 08 00.1728975807 -39 02 59.503265866   16.94 17.01 16.72 14.31 M5.5e 34 0
51 Sz 96 TT* 16 08 12.6306575418 -39 08 33.469578208   14.80 13.43 13.69 11.84 ~ 65 0
52 2MASS J16081497-3857145 Y*O 16 08 14.9860473609 -38 57 14.441818824       18.93 17.42 4.75 33 0
53 THA 15-24 Y*O 16 08 21.8039413126 -39 04 21.489571046   16.18 14.61 14.67 12.92 M3 46 0
54 V* V1279 Sco Or* 16 08 22.4935035747 -39 04 46.427826148   14.99 13.66 11.70 11.21 M0.4 88 1
55 THA 15-25 Y*O 16 08 24.0420404465 -39 05 49.434128359   15.49 16.00 15.39 14.17 M3.5 38 0
56 THA 15-26 Y*O 16 08 25.7651773769 -39 06 01.220655906   16.62 15.43 14.97 13.12 M5 53 0
57 [LEM2005] Lup 607 Y*O 16 08 28.08 -39 13 09.8   17.45   17.76 16.13 M6.5 17 0
58 WRAY 16-203 Or* 16 08 29.7086692265 -39 03 10.994386198   16.26 15.91 15.38 15.69 K0: 153 1
59 THA 15-29 Y*O 16 08 30.2690257641 -39 06 11.174771741   14.8 11.14 15.18 13.15 M4 52 0
60 IRAS 16051-3820 Y*O 16 08 30.6992185515 -38 28 26.847010777   11.89 11.15 10.67   K2 39 0
61 THA 15-30 TT* 16 08 30.8149015625 -39 05 48.840814971   15.2 15.25 13.96 13.57 M5 48 0
62 V* V1094 Sco TT* 16 08 36.1770068081 -39 23 02.462096497 16.01 15.00 13.48 12.47 11.45 ~ 54 1
63 2MASS J16083733-3923109 Y*O 16 08 37.3342512532 -39 23 10.926425276   20.1 19.1 20.70 18.44 M7.5e 19 0
64 Sz 106 Y*O 16 08 39.7599221819 -39 06 25.320570812   15.1   15.00 14.66 M2.5 38 0
65 NAME Sz 108B Y*O 16 08 42.8841122475 -39 06 14.695751140       17.71 14.39 M5 25 0
66 IRAS 16054-3857 Y*O 16 08 49.3978327073 -39 05 39.440608212   16.76 17.71 15.89 14.24 M4.5 43 0
67 V* V1192 Sco Or* 16 08 51.4339982240 -39 05 30.468181083     21.9 18.97 18.18 M5 60 0
68 V* V1193 Sco Or* 16 08 51.5694611925 -39 03 17.705756264   15.27 14.58 13.72 12.28 M4.5 55 0
69 2MASS J16085324-3914401 Y*O 16 08 53.2415720407 -39 14 40.165579947   17.53 16.35 15.35 13.52 M3 33 1
70 2MASS J16085373-3914367 Y*O 16 08 53.7314563013 -39 14 36.829640504       21.73 18.76 M5.5 28 0
71 THA 15-33 TT* 16 08 54.6847312618 -39 37 43.145460615   15.34 13.98 13.29   M1IVe 64 0
72 2MASS J16085529-3848481 Y*O 16 08 55.2905019030 -38 48 48.173805375   17.36   17.24 15.24 M6.5 25 1
73 Sz 112 Y*O 16 08 55.5292331003 -39 02 33.939799154   16.62 15.39 14.78 12.93 M6 54 0
74 THA 15-34 Y*O 16 08 57.8033256003 -39 02 22.851598056   17.46 16.50 16.64 14.65 M6 46 0
75 2MASS J16085953-3856275 Y*O 16 08 59.5393748161 -38 56 27.596410166       19.25 16.91 M8.5e 23 0
76 2MASS J16090141-3925119 Y*O 16 09 01.4148763417 -39 25 11.923408383   16.92 15.31 15.04 13.48 M4 35 0
77 THA 15-35 Or* 16 09 01.8488471357 -39 05 12.416220509   15.33 14.12 14.35 12.54 M5.5 72 0
78 Sz 115 TT* 16 09 06.2136491733 -39 08 51.871061306   16.88 15.48 15.09 13.12 ~ 39 0
79 2MASS J16092697-3836269 Y*O 16 09 26.975 -38 36 26.92   17.55   16.31 14.74 M4.5 20 0
80 NAME Lupus III SFR 16 09.6 -39 03           ~ 273 0
81 THA 15-37 Y*O 16 09 44.3608441561 -39 13 30.167268370   15.84 14.59 14.20 12.38 M2 48 0
82 Sz 118 Y*O 16 09 48.6557347813 -39 11 16.846032967   18.32 16.90 16.61 15.00 K6 49 0
83 2MASS J16095628-3859518 Y*O 16 09 56.2955801075 -38 59 51.582757696   17.37 18.0 16.49 15.28 M6 33 0
84 SONYC Lup3-29 Y*O 16 10 01.3309952901 -39 06 44.824860359   18.38 17.42 17.90 15.27 M7.5 22 0
85 2MASS J16101857-3836125 Y*O 16 10 18.5683658482 -38 36 12.598285096   18.37 16.63 16.67 14.70 M5 19 0
86 2MASS J16101984-3836065 Y*O 16 10 19.8339336690 -38 36 06.581180628   17.39   16.76 15.57 M6.5 25 0
87 2MASS J16102955-3922144 Y*O 16 10 29.5512951868 -39 22 14.456010068   17.51 16.31 15.79 13.90 M4.5 37 0
88 THA 15-42 Y*O 16 10 51.5851116158 -38 53 13.768173219   15.89 14.48 14.44 12.95 M1e 55 0
89 2MASS J16115979-3823383 TT* 16 11 59.7951623767 -38 23 38.375533996   18.17 16.55 16.24 14.26 M5.0e 37 0
90 2MASS J16124373-3815031 Y*O 16 12 43.7500201062 -38 15 03.075872612   15.00 13.44 13.39 11.61 M1 28 0
91 2MASS J16134410-3736462 Y*O 16 13 44.1006863103 -37 36 46.261197711   17.97   16.37 14.66 M5 19 0
92 EM* SR 21A TT* 16 27 10.2776332501 -24 19 12.620553212   16.08 14.10     G1 234 1

    Equat.    Gal    SGal    Ecl

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2020.10.21-16:14:49

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