J/A+A/628/A68 SPHERE image of RY Tau (Garufi+, 2019)
SPHERE view of the jet and the envelope of RY Tauri.
Garufi A., Podio L., Bacciotti F., Antoniucci S., Boccaletti A.,
Codella C., Dougados C., Menard F., Mesa D., Meyer M., Nisini B.,
Schmid H.M., Stolker T., Baudino J.L., Biller B., Bonavita M., Bonnefoy M.,
Cantalloube F., Chauvin G., Cheetham A., Desidera S., D'Orazi V., Feldt M.,
Galicher R., Grandjean A., Gratton R., Hagelberg J., Lagrange A.M.,
Langlois M., Lannier J., Lazzoni C., Maire A.L., Perrot C., Rickman E.,
Schmidt T., A.Vigan, Zurlo A., Delboulbe A., Le Mignant D., Fantinel D.,
Moeller-Nilsson O., Weber L., Sauvage J.-F.
<Astron. Astrophys. 628, A68 (2019)>
=2019A&A...628A..68G 2019A&A...628A..68G (SIMBAD/NED BibCode)
ADC_Keywords: Stars, pre-main sequence ; Photometry, millimetric/submm
Keywords: ISM: jets and outflows - planet-disk interactions -
stars: variables: T Tauri, Herbig Ae/Be - protoplanetary disks -
infrared: stars
Abstract:
Jets are rarely associated with pre-main-sequence intermediate-mass
stars. This contrasts with the frequent detection of jets in
lower-mass or younger stars. Optical and near-IR observations of
jet-driving sources are often hindered by the presence of a natal
envelope.
Jets around partly embedded sources are a useful diagnostic to
constrain the geometry of the concealed protoplanetary disk. In fact,
the jet-driving mechanisms are affected by both spatial anisotropies
and episodic variations at the (sub-)au scale from the star.
We obtained a rich set of high-contrast VLT/SPHERE observations from
0.6um to 2.2um of the young intermediate-mass star RY Tau. Given the
proximity to the Sun of this source, our images have the highest
spatial resolution ever obtained for an atomic jet (down to 4au).
Optical observations in polarized light show no sign of the
protoplanetary disk detected by ALMA. Instead, we observed a diffuse
signal resembling a remnant envelope with an outflow cavity. The jet
is detected in the Hα, [SII] at 1.03um, HeI at 1.08um, and
[FeII] lines in the 1.25um and 1.64um. The jet appears to be wiggling
and its radial width increasing with the distance is complementary to
the shape of the outflow cavity suggesting a strong jet/envelope
interaction. Through the estimated tangential velocity (∼100km/s), we
revealed a possible connection between the launching time of the jet
sub-structures and the stellar activity of RY Tau.
RY Tau is at an intermediate stage toward the dispersal of the natal
envelope. This source shows episodic increases of mass accretion
/ejection similarly to other known intermediate-mass stars. The amount
of observed jet wiggle is consistent with the presence of a precessing
disk warp or misaligned inner disk that would be induced by an unseen
planetary/sub-stellar companion at sub-/few-au scales. The high disk
mass of RY Tau and of two other jet-driving intermediate-mass stars,
HD163296 and MWC480, suggests that massive, full disks are more
efficient at launching prominent jets.
Description:
Multiple images of RY Tau were taken in the context of the guaranteed
time observations of the high-contrast imager SPHERE operating at the
Very Large Telescope (VLT) in conjunction with the extreme adaptive
optics (AO) system SAXO.
Objects:
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RA (2000) DE Designation(s)
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04 21 57.41 +28 26 35.5 RY Tau = HD 283571
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 158 1 Informations on fits image
fits/* . 1 fits image
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See also:
J/A+A/341/553 : RY Tau in 1996 (Petrov+ 1999)
Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 8 F8.5 deg RAdeg Right Ascension of center (J2000)
9- 17 F9.5 deg DEdeg Declination of center (J2000)
19- 22 I4 --- Nx Number of pixels along X-axis
24- 27 I4 --- Ny Number of pixels along Y-axis
29- 52 A24 "datime" Obs.date Observation date
54- 57 I4 Kibyte size Size of FITS file
59-130 A72 --- FileName Name of FITS file, in subdirectory fits
132-158 A27 --- Title Title of the FITS file
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Acknowledgements:
Antonio Garufi, agarufi(at)arcetri.astro.it
(End) Patricia Vannier [CDS] 30-Jun-2019