2018A&A...616A..79G


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.11CEST20:54:13

2018A&A...616A..79G - Astronomy and Astrophysics, volume 616A, 79-79 (2018/8-1)

First direct detection of a polarized companion outside a resolved circumbinary disk around CS Chamaeleonis.

GINSKI C., BENISTY M., VAN HOLSTEIN R.G., JUHASZ A., SCHMIDT T.O.B., CHAUVIN G., DE BOER J., WILBY M., MANARA C.F., DELORME P., MENARD F., PINILLA P., BIRNSTIEL T., FLOCK M., KELLER C., KENWORTHY M., MILLI J., OLOFSSON J., PEREZ L., SNIK F. and VOGT N.

Abstract (from CDS):


Aims. To understand planet formation it is necessary to study the birth environment of planetary systems. Resolved imaging of young planet forming disks allows us to study this environment in great detail and find signs of planet-disk interaction and disk evolution. In the present study we aim to investigate the circumstellar environment of the spectroscopic binary T Tauri star CS Cha. From unresolved mid-to far-infrared photometry it is predicted that CS Cha hosts a disk with a large cavity. In addition, spectral energy distribution modeling suggests significant dust settling, pointing toward an evolved disk that may show signs of ongoing or completed planet formation.
Methods. We observed CS Cha with the high contrast imager SPHERE at the ESO Very Large Telescope (VLT) in polarimetric differential imaging mode to resolve the circumbinary disk in near-infrared scattered light. These observations were followed up by VLT/NACO L-band observations and complemented by archival VLT/NACO K-band and Hubble Space Telescope WFPC2 I-band data.
Results. We resolve the compact circumbinary disk around CS Cha for the first time in scattered light. We find a smooth, low inclination disk with an outer radius of ∼55au (at 165pc). We do not detect the inner cavity but find an upper limit for the cavity size of ∼15au. Furthermore, we find a faint comoving companion with a projected separation of 210au from the central binary outside of the circumbinary disk. The companion is detected in polarized light and shows an extreme degree of polarization (13.7±0.4% in the J band). The J- and H-band magnitudes of the companion are compatible with masses of a few MJup. However, K-, L-, and I-band data draw this conclusion into question. We explore with radiative transfer modeling whether an unresolved circum-companion disk can be responsible for the high polarization and complex photometry. We find that the set of observations is best explained by a heavily extincted low-mass (∼20MJup) brown dwarf or high-mass planet with an unresolved disk and dust envelope.

Abstract Copyright: © ESO 2018

Journal keyword(s): stars: individual: CS Cha - protoplanetary disks - planet-disk interactions - techniques: polarimetric

Simbad objects: 29

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Number of rows : 29

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 NGC 104 GlC 00 24 05.359 -72 04 53.20   5.78 4.09     ~ 3548 0
2 HD 17637 * 02 58 44.4753683609 +80 24 48.608272722   10.10 8.99     K5V 6 0
3 V* FW Tau Or* 04 29 29.703744 +26 16 53.06412       15.85   M5.5 116 0
4 V* HL Tau Or* 04 31 38.471952 +18 13 58.08504   15.89 14.49 14.39   K5 1201 0
5 V* HK Tau Or* 04 31 50.5722969258 +24 24 17.775488652 16.81   15.10     M0.5 295 1
6 NAME CVSO 30 c Pl? 05 25 07.5563565811 +01 34 24.349287546           ~ 5 0
7 HD 36112 Ae* 05 30 27.5286772598 +25 19 57.082162439   8.57 8.27     A8Ve 358 0
8 NAME Ori B MoC 05 41 43.0 -01 54 44           ~ 1164 0
9 V* CE Ant TT* 10 42 30.1021269333 -33 40 16.226774953   12.21 10.91   9.10 M2Ve 151 1
10 V* TW Hya TT* 11 01 51.9054298616 -34 42 17.031550898   11.94 10.50 10.626 9.18 K6Ve 1532 1
11 V* CS Cha Or* 11 02 24.8849252208 -77 33 35.683462615   12.88 11.69   10.123 K2Ve 191 0
12 V* CT Cha B LM* 11 04 08.44 -76 27 18.0           M8 39 0
13 V* CT Cha Or* 11 04 09.0989057683 -76 27 19.326914289   13.44 13.00   10.89 K7Ve 109 0
14 NAME Cha I MoC 11 06 48 -77 18.0           ~ 968 1
15 HD 97048 Ae* 11 08 03.3105687971 -77 39 17.491180130 9.03 8.76 9.00   8.64 A0Vep 458 0
16 [L2007b] Cha J11110675-7636030 BD* 11 11 06.75 -76 36 03.0           L0 3 0
17 HD 100453 Ae* 11 33 05.5765928993 -54 19 28.543792679   8.09 7.79     A9Ve 196 1
18 V* DZ Cha Or* 11 49 31.8520891363 -78 51 01.058647109     12.832   10.732 M0Ve 62 0
19 NAME Cha Dark Cloud SFR 11 55 -78.0           ~ 557 1
20 V* T Cha Or* 11 57 13.5268556629 -79 21 31.521755129   10.00 11.86     K0e 234 1
21 HD 106906B BD* 12 17 52.61 -55 58 26.6           L2.5 53 0
22 ASAS J140748-3945.7 pr* 14 07 47.9296051120 -39 45 42.766332988   13.56 12.31 11.91 10.92 K5IVe 50 0
23 CPD-36 6759 Y*O 15 15 48.4459023859 -37 09 16.026315179   9.21 8.708     F8V 357 1
24 GSS 39 Y*O 16 26 45.0321556934 -24 23 07.808781522           M0 142 1
25 YLW 15 Y*O 16 27 26.93640 -24 40 50.8224           ~ 240 1
26 NGC 6380 GlC 17 34 28.00 -39 04 09.0           ~ 97 0
27 * alf Lyr dS* 18 36 56.33635 +38 47 01.2802 0.03 0.03 0.03 0.07 0.10 A0Va 2505 0
28 HD 203030B BD* 21 18 58.97 +26 13 46.1           L7.5 57 0
29 HD 218396 El* 23 07 28.7156905667 +21 08 03.302133882   6.21 5.953     F0+VkA5mA5 896 0

    Equat.    Gal    SGal    Ecl

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2020.07.11-20:54:13

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