2014A&A...566A..51T


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.04CEST14:40:32

2014A&A...566A..51T - Astronomy and Astrophysics, volume 566A, 51-51 (2014/6-1)

The architecture of the LkCa 15 transitional disk revealed by high-contrast imaging.

THALMANN C., MULDERS G.D., HODAPP K., JANSON M., GRADY C.A., MIN M., DE JUAN OVELAR M., CARSON J., BRANDT T., BONNEFOY M., McELWAIN M.W., LEISENRING J., DOMINIK C., HENNING T. and TAMURA M.

Abstract (from CDS):

We present four new epochs of Ks-band images of the young pre-transitional disk around LkCa 15 and perform extensive forward modeling to derive the physical parameters of the disk. We find indications of strongly anisotropic scattering (Henyey-Greenstein g=0.67+0.18–0.11) and a significantly tapered gap edge (``round wall'') but see no evidence that the inner disk, whose existence is predicted by the spectral energy distribution, shadows the outer regions of the disk visible in our images. We marginally confirm the existence of an offset between the disk center and the star along the line of nodes; however, the magnitude of this offset (x=27–20+19mas) is notably lower than that found in our earlier H-band images. Intriguingly, we also find an offset of y=69+49–25mas perpendicular to the line of nodes at high significance. If confirmed by future observations, this would imply a highly elliptical - or otherwise asymmetric - disk gap with an effective eccentricity of e≃0.3. Such asymmetry would most likely be the result of dynamical sculpting by one or more unseen planets in the system. Finally, we find that the bright arc of scattered light we see in direct imaging observations originates from the near side of the disk and appears brighter than the far side because of strong forward scattering.

Abstract Copyright:

Journal keyword(s): stars: individual: LkCa 15 - stars: pre-main sequence - planetary systems - planets and satellites: formation - disks protoplanetary

Simbad objects: 8

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Number of rows : 8

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 283240 * 03 59 14.2610644695 +26 14 20.732341548   12.26 11.04     M 7 0
2 EM* LkCa 15 Or* 04 39 17.7912813350 +22 21 03.387667491   13.01 12.03 11.61   K5:Ve 552 1
3 V* V1363 Tau RS* 05 22 47.1681062354 +24 37 31.141937303   12.74 11.48 10.77   K4 5 0
4 V* TW Hya TT* 11 01 51.9054298616 -34 42 17.031550898   11.94 10.50 10.626 9.18 K6Ve 1532 1
5 HD 100546 Be* 11 33 25.4404858122 -70 11 41.239343121   6.71 6.30   6.64 A0VaekB8_lB 651 1
6 V* T Cha Or* 11 57 13.5268556629 -79 21 31.521755129   10.00 11.86     K0e 234 1
7 HD 142527 Ae* 15 56 41.8888096574 -42 19 23.245384377   9.04 8.34     F6III 467 1
8 HD 146897 Ro* 16 19 29.2420604682 -21 24 13.271535164   9.58 9.11     F2/3V 62 0

    Equat.    Gal    SGal    Ecl

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2020.07.04-14:40:32

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