2016ApJ...825..127R

Query : 2016ApJ...825..127R

2016ApJ...825..127R - Astrophys. J., 825, 127-127 (2016/July-2)

High-contrast imaging of intermediate-mass giants with long-term radial velocity trends.

RYU T., SATO B., KUZUHARA M., NARITA N., TAKAHASHI Y.H., UYAMA T., KUDO T., KUSAKABE N., HASHIMOTO J., OMIYA M., HARAKAWA H., ABE L., ANDO H., BRANDNER W., BRANDT T.D., CARSON J.C., CURRIE T., EGNER S., FELDT M., GOTO M., GRADY C.A., GUYON O., HAYANO Y., HAYASHI M., HAYASHI S.S., HELMINIAK K.G., HENNING T., HODAPP K.W., IDA S., ISHII M., ITOH Y., IYE M., IZUMIURA H., JANSON M., KAMBE E., KANDORI R., KNAPP G.R., KOKUBO E., KWON J., MATSUO T., MAYAMA S., McELWAIN M.W., MEDE K., MIYAMA S., MORINO J.-I., MORO-MARTIN A., NISHIMURA T., PYO T.-S., SERABYN E., SUENAGA T., SUTO H., SUZUKI R., TAKAMI M., TAKATO N., TAKEDA Y., TERADA H., THALMANN C., TURNER E.L., WATANABE M., WISNIEWSKI J., YAMADA T., YOSHIDA M., TAKAMI H., USUDA T. and TAMURA M.

Abstract (from CDS):

A radial velocity (RV) survey for intermediate-mass giants has been in operation for over a decade at Okayama Astrophysical Observatory (OAO). The OAO survey has revealed that some giants show long-term linear RV accelerations (RV trends), indicating the presence of outer companions. Direct-imaging observations can help clarify what objects generate these RV trends. We present the results of high-contrast imaging observations of six intermediate-mass giants with long-term RV trends using the Subaru Telescope and HiCIAO camera. We detected co-moving companions to γ Hya B ( {0.61}{–0.14}{+0.12}{M}_☉ ), HD 5608 B ( 0.10±0.01{M}_☉ ), and HD 109272 B ( 0.28±0.06{M}_☉ ). For the remaining targets (ι Dra, 18 Del, and HD 14067), we exclude companions more massive than 30-60 MJup at projected separations of 1''-7''. We examine whether these directly imaged companions or unidentified long-period companions can account for the RV trends observed around the six giants. We find that the Kozai mechanism can explain the high eccentricity of the inner planets ι Dra b, HD 5608 b, and HD 14067 b.

Abstract Copyright: © 2016. The American Astronomical Society. All rights reserved.

Journal keyword(s): binaries: general - methods: observational - planetary systems - techniques: high angular resolution - techniques: radial velocities

Simbad objects: 14

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Number of rows : 14
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 HD 5608 SB* 00 58 14.2189353000 +33 57 03.184089156   6.996 5.980     K0III 74 1
2 HD 5608b Pl 00 58 14.2189353000 +33 57 03.184089156           ~ 12 1
3 HD 14067b Pl 02 17 10.4400107760 +23 46 04.190343312           ~ 12 0
4 HD 14067 PM* 02 17 10.4400107760 +23 46 04.190343312 8.370 7.550 6.510     G9III 46 0
5 HD 109272 SB* 12 33 34.2587678832 -12 49 48.735952248   6.437 5.582     G8III/IV 57 0
6 * gam Hya SB* 13 18 55.2976891983 -23 10 17.450424894 4.58 3.92 3.00 2.40 1.93 G8IIIa 192 0
7 HD 126614 PM* 14 26 48.2794944240 -05 10 40.013055624   9.662 8.787     G8IV 126 1
8 M 5 GlC 15 18 33.22 +02 04 51.7     5.95     ~ 2095 0
9 * iot Dra V* 15 24 55.7738042889 +58 57 57.837111857 5.68 4.45 3.29 2.51 1.91 K2III 428 1
10 * iot Dra b Pl 15 24 55.7746265 +58 57 57.834445           ~ 59 1
11 * 18 Del b Pl 20 58 25.9335294984 +10 50 21.430869504           ~ 19 1
12 * 18 Del PM* 20 58 25.9335294984 +10 50 21.430869504   6.432 5.506     G6III 107 1
13 BD+10 4426 * 20 58 30.5073320472 +10 47 15.961297704   11.27 9.69     K5 4 0
14 M 15 GlC 21 29 58.33 +12 10 01.2           ~ 3274 0

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