2020ApJ...893L..29B


Query : 2020ApJ...893L..29B

2020ApJ...893L..29B - Astrophys. J., 893, L29-L29 (2020/April-3)

WASP-4 is accelerating toward the Earth.

BOUMA L.G., WINN J.N., HOWARD A.W., HOWELL S.B., ISAACSON H., KNUTSON H. and MATSON R.A.

Abstract (from CDS):

The orbital period of the hot Jupiter WASP-4b appears to be decreasing at a rate of -8.64 ± 1.26 ms yr–1, based on transit-timing measurements spanning 12 yr. Proposed explanations for the period change include tidal orbital decay, apsidal precession, and acceleration of the system along the line of sight. To investigate further, we performed new radial-velocity measurements and speckle imaging of WASP-4. The radial-velocity data show that the system is accelerating toward the Sun at a rate of -0.0422 ± 0.0028 m s–1 day–1. The associated Doppler effect should cause the apparent period to shrink at a rate of -5.94 ± 0.39 ms yr–1, comparable to the observed rate. Thus, the observed change in the transit period is mostly or entirely produced by the line-of-sight acceleration of the system. This acceleration is probably caused by a wide-orbiting companion of mass 10-300 MJup and orbital distance 10-100 au, based on the magnitude of the radial-velocity trend and the nondetection of any companion in the speckle images. We expect that the orbital periods of one out of three hot Jupiters will change at rates similar to WASP-4b, based on the hot-Jupiter companion statistics of Knutson et al. Continued radial-velocity monitoring of hot Jupiters is therefore essential to distinguish the effects of tidal orbital decay or apsidal precession from line-of-sight acceleration.

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

Journal keyword(s): Exoplanet tides - Exoplanet dynamics - Radial velocity - Transit timing variation method

VizieR on-line data: <Available at CDS (J/ApJ/893/L29): table1.dat table2.dat table5.dat>

Simbad objects: 61

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Number of rows : 61
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 WASP-1b Pl 00 20 40.0746033057 +31 59 23.953709844           ~ 126 1
2 HAT-P-16b Pl 00 38 17.5584478065 +42 27 47.216927539           ~ 49 1
3 HD 10069b Pl 01 37 25.0335097438 -45 40 40.376513381           ~ 310 1
4 HAT-P-32b Pl 02 04 10.2775457769 +46 41 16.210382751           ~ 119 1
5 WASP-53 * 02 07 38.2094562696 -20 39 42.758493948   13.54 12.60 12.44 11.65 ~ 25 1
6 HAT-P-29b Pl 02 12 31.4784785872 +51 46 43.562095527           ~ 27 1
7 WASP-11b Pl 03 09 28.5427034552 +30 40 24.868785834           ~ 64 1
8 WASP-11 ** 03 09 28.5433589520 +30 40 24.862993356   12.58 11.57 11.42   K3V 75 1
9 WASP-22b Pl 03 31 16.3269748036 -23 49 10.841600521           ~ 38 1
10 BD+57 793b Pl 04 21 52.7044170433 +57 49 01.892074012           ~ 200 1
11 HAT-P-15b Pl 04 24 59.5347962291 +39 27 38.312403582           ~ 45 1
12 WASP-12b Pl 06 30 32.7966788910 +29 40 20.266334158           G0 682 1
13 CoRoT-20 * 06 30 52.9022402976 +00 13 36.858436428   15.41 14.66 14.60 13.69 ~ 22 2
14 HAT-P-24b Pl 07 15 18.0194123517 +14 15 45.409653547           ~ 35 1
15 XO-4b Pl 07 21 33.1602110129 +58 16 05.111704885           ~ 60 1
16 HAT-P-20b Pl 07 27 39.9487418539 +24 20 11.518276475           ~ 68 1
17 HAT-P-33b Pl 07 32 44.2170736940 +33 50 06.118002888           ~ 43 1
18 XO-5b Pl 07 46 51.9615004947 +39 05 40.460564688           ~ 48 1
19 BD+50 1471b Pl 07 48 06.4723053776 +50 13 32.920598923           ~ 146 1
20 BD+06 1909b Pl 08 15 47.9805310385 +05 50 12.352063199           ~ 49 1
21 HAT-P-13b Pl 08 39 31.8073600797 +47 21 07.275628863           ~ 101 1
22 WASP-19b Pl 09 53 40.0764883458 -45 39 33.055979403           ~ 329 1
23 HD 233731b Pl 10 22 43.5924378707 +50 07 42.063457528           ~ 35 1
24 CD-23 9677 PM* 11 01 35.8978277184 -23 51 38.386984896   11.05 10.28 10.21 9.66 ~ 52 1
25 CD-23 9677b Pl 11 01 35.8978900078 -23 51 38.384687448           ~ 39 1
26 HATS-59 * 11 21 17.8649774760 -22 23 17.452377924           ~ 9 0
27 Ross 905b Pl 11 42 11.0933874353 +26 42 23.658083337           ~ 719 1
28 CD-31 10766b Pl 13 55 42.7119654298 -32 09 34.615276547           ~ 63 1
29 HAT-P-12b Pl 13 57 33.4668726399 +43 29 36.601508739           ~ 151 1
30 HAT-P-26b Pl 14 12 37.5331103311 +04 03 36.116569918           ~ 133 1
31 WASP-16b Pl 14 18 43.9226513410 -20 16 31.842223819           ~ 42 1
32 BD+22 2716b Pl 14 33 06.3573673505 +21 53 40.982782397           ~ 148 1
33 WASP-24b Pl 15 08 51.7366806893 +02 20 35.964406086           ~ 48 1
34 BD+36 2593b Pl 15 19 57.9205371377 +36 13 46.737977732           ~ 73 1
35 CD-27 10695b Pl 15 59 50.9489706053 -28 03 42.309432433           ~ 230 1
36 HD 146389b Pl 16 15 50.3652643210 +10 01 57.284401784           ~ 46 1
37 HD 147506b Pl 16 20 36.3579144486 +41 02 53.109043943           ~ 237 1
38 HD 149026b Pl 16 30 29.6184841164 +38 20 50.310893575           ~ 326 1
39 HAT-P-18b Pl 17 05 23.1475847690 +33 00 44.939145027           ~ 84 1
40 BD+38 2917b Pl 17 20 27.8782981532 +38 14 31.909663582           ~ 61 1
41 TrES-3 Pl 17 52 07.0185036683 +37 32 46.237002085           ~ 215 2
42 TrES-4 Pl 17 53 13.0490781575 +37 12 42.586106196           ~ 194 2
43 HAT-P-31b Pl 18 06 09.0499030368 +26 25 35.989709681           ~ 27 1
44 BD+35 3293b Pl 18 34 31.6255913635 +35 39 41.489193276           ~ 108 1
45 Kepler-1b Pl 19 07 14.0379171930 +49 18 59.090895318           ~ 305 2
46 BD+47 2846b Pl 19 28 59.3538131541 +47 58 10.216250846           ~ 337 1
47 BD+47 2936 EB* 19 50 50.2472976936 +48 04 51.101390496       8.8   K4V 261 2
48 BD+47 2936b Pl 19 50 50.2474562793 +48 04 51.097364378           ~ 361 1
49 HD 351766b Pl 20 12 46.8867073562 +18 06 17.399935067           ~ 33 1
50 WASP-81 * 20 16 49.8902431128 +03 17 38.458392288   13.09 12.47 12.37 11.70 ~ 16 0
51 WASP-2b Pl 20 30 54.1279218812 +06 25 46.338261893           ~ 97 1
52 HD 197286b Pl 20 44 10.2207500229 -39 13 30.859306335           ~ 58 1
53 HAT-P-17 PM* 21 38 08.7310010424 +30 29 19.446386748   11.33 10.38 10.24   G0 51 1
54 HAT-P-17b Pl 21 38 08.7311406378 +30 29 19.445574063           ~ 67 1
55 BD+34 4779b Pl 22 52 09.8635559135 +35 26 49.606963112           ~ 73 1
56 WASP-10b Pl 23 15 58.3005497925 +31 27 46.294728182           ~ 102 1
57 WASP-4 PM* 23 34 15.0857248317 -42 03 41.047972591   13.51 12.48 11.9   G7V 154 1
58 WASP-4b Pl 23 34 15.0857248317 -42 03 41.047972591           ~ 150 1
59 BD+41 4831b Pl 23 39 05.8101319829 +42 27 57.503480354           ~ 79 1
60 CD-35 16019b Pl 23 59 36.0711854449 -35 01 52.923483315           ~ 112 0
61 CD-35 16019 PM* 23 59 36.0711872328 -35 01 52.923618408   10.49 9.87 9.91   G6 96 0

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2022.10.03-01:14:15

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