2020ApJ...898L..38R

Query : 2020ApJ...898L..38R

2020ApJ...898L..38R - Astrophys. J., 898, L38-L38 (2020/August-1)

Dynamical evidence of a spiral arm-driving planet in the MWC 758 protoplanetary disk.

REN B., DONG R., VAN HOLSTEIN R.G., RUFFIO J.-B., CALVIN B.A., GIRARD J.H., BENISTY M., BOCCALETTI A., ESPOSITO T.M., CHOQUET E., MAWET D., PUEYO L., STOLKER T., CHIANG E., DE BOER J., DEBES J.H., GARUFI A., GRADY C.A., HINES D.C., MAIRE A.-L., MENARD F., MILLAR-BLANCHAER M.A., PERRIN M.D., POTEET C.A. and SCHNEIDER G.

Abstract (from CDS):

More than a dozen young stars host spiral arms in their surrounding protoplanetary disks. The excitation mechanisms of such arms are under debate. The two leading hypotheses-companion-disk interaction and gravitational instability (GI)-predict distinct motion for spirals. By imaging the MWC 758 spiral arm system at two epochs spanning ∼5 yr using the SPHERE instrument on the Very Large Telescope, we test the two hypotheses for the first time. We find that the pattern speeds of the spirals are not consistent with the GI origin. Our measurements further evince the existence of a faint "missing planet" driving the disk arms. The average spiral pattern speed is 0.°22 ± 0.°03 yr–1, pointing to a driver at 172–14+18 au around a 1.9 M☉ central star if it is on a circular orbit. In addition, we witness time-varying shadowing effects on a global scale that are likely originating from an inner disk.

Abstract Copyright: © 2020. The American Astronomical Society. All rights reserved.

Journal keyword(s): Protoplanetary disks - Coronagraphic imaging - Planetary system formation - Orbital motion

VizieR on-line data: <Available at CDS (J/ApJ/898/L38): files.dat img/*>

Simbad objects: 4

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Number of rows : 4
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 V* UX Tau Or* 04 30 03.99626 +18 13 49.4355 11.23 11.84 10.80 9.83 9.05 K2Ve+M1Ve 355 0
2 HD 36112 Ae* 05 30 27.5285630040 +25 19 57.076288752   8.57 8.27     A8Ve 469 0
3 V* TW Hya TT* 11 01 51.9053285064 -34 42 17.033218380   11.94 10.50 10.626 9.18 K6Ve 1892 1
4 HD 100453 Ae* 11 33 05.5766482920 -54 19 28.547100696   8.09 7.79     F1Vn 284 1

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