J/A+A/622/A156 A search for accreting young companions (Cugno+, 2019)
A search for accreting young companions embedded in circumstellar disks.
High-contrast Hα imaging with VLT/SPHERE.
Cugno G., Quanz S.P., Hunziker S., Stolker T., Schmid H.M., Avenhaus H.,
Baudoz P., Bohn A.J., Bonnefoy M., Buenzli E., Chauvin G., Cheetham A.,
Desidera S., Dominik C., Feautrier P., Feldt M., Ginski C., Girard J.H.,
Gratton R., Hagelberg J., Hugot E., Janson M., Lagrange A.-M., Langlois M.,
Magnard Y., Maire A.-L., Menard F., Meyer M., Milli J., Mordasini C.,
Pinte C., Pragt J., Roelfsema R., Rigal F., Szulagyi J., van Boekel R.,
van der Plas G., Vigan A., Wahhaj Z., Zurlo A.
<Astron. Astrophys. 622, A156 (2019)>
=2019A&A...622A.156C 2019A&A...622A.156C (SIMBAD/NED BibCode)
ADC_Keywords: Stars, emission ; Photometry, H-alpha
Keywords: planet-disk interactions - planetary systems -
techniques: high angular resolution -
planets and satellites: detection
Abstract:
In recent years, our understanding of giant planet formation
progressed substantially. There have even been detections of a few
young protoplanet candidates still embedded in the circumstellar disks
of their host stars. The exact physics that describes the accretion of
material from the circumstellar disk onto the suspected
circumplanetary disk and eventually onto the young, forming planet is
still an open question.
We seek to detect and quantify observables related to accretion
processes occurring locally in circumstellar disks, which could be
attributed to young forming planets. We focus on objects known to host
protoplanet candidates and/or disk structures thought to be the result
of interactions with planets. We analyzed observations of six young
stars and their surrounding environments with the SPHERE/ZIMPOL
instrument on the Very Large Telescope (VLT) in the Hα filter
(656nm) and a nearby continuum filter (644.9nm). We redetect the
known accreting M-star companion HD142527 B with the highest published
signal to noise to date in both Hα and the continuum. No other
companions are detected.
We analyzed observations of six young stars (age 3.5-10Myr) and their
surrounding environments with the SPHERE/ZIMPOL instrument on the Very
Large Telescope (VLT) in the Hαfilter (656nm) and a nearby
continuum filter (644.9nm). We applied several point spread function
(PSF) subtraction techniques to reach the highest possible contrast
near the primary star, specifically investigating regions where
forming companions were claimed or have been suggested based on
observed disk morphology.
Description:
Fits images presented in the paper. For HD142527, all images obtained
with different filters and techniques are made available. For the
other object of the target list, only one image is available. For the
observations, we used SPHERE/ZIMPOL in Hα imaging mode, while
for the analysis we used the Zurich Zimpol Pipeline and the PynPoint
package.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 113 11 List of fits images
fits/* . 11 Individual fits images
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Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Name Star name
12- 13 I2 h RAh Right ascension (J2000)
15- 16 I2 min RAm Right ascension (J2000)
18- 22 F5.2 s RAs Right ascension (J2000)
24 A1 --- DE- Declination sign (J2000)
25- 26 I2 deg DEd Declination (J2000)
28- 29 I2 arcmin DEm Declination (J2000)
31- 35 F5.2 arcsec DEs Declination (J2000)
37- 39 I3 --- Nx Number of pixels along X-axis
41- 43 I3 --- Ny Number of pixels along Y-axis
45- 47 I3 Kibyte size Size of FITS file
49- 70 A22 --- FileName Name of FITS file, in subdirectory fits
72-113 A42 --- Title Title of the FITS file
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Acknowledgements:
Gabriele Cugno, gabriele.cugno(at)phys.ethz.ch
(End) Patricia Vannier [CDS] 31-Jan-2019