2020ApJ...890...41K

Query : 2020ApJ...890...41K

2020ApJ...890...41K - Astrophys. J., 890, 41-41 (2020/February-2)

Close-in exoplanets as candidates for strange quark matter objects.

KUERBAN A., GENG J.-J., HUANG Y.-F., ZONG H.-S. and GONG H.

Abstract (from CDS):

Since the true ground state of hadrons may be strange quark matter (SQM), pulsars may actually be strange stars rather than neutron stars. According to this SQM hypothesis, strange planets can also stably exist. The density of normal matter planets can hardly be higher than 30 g cm–3. They will be tidally disrupted when the orbital radius is less than ∼5.6 x 1010 cm, or when the orbital period (Porb) is less than ∼6100 s. However, an SQM planet can safely survive even when it is very close to the host, due to its high density. This feature can help us identify SQM objects. Here, we have tried to search for SQM objects among close-in exoplanets orbiting around pulsars. It is found that four pulsar planets (XTE J1807-294 b, XTE J1751-305 b, PSR 0636 b, PSR J1807-2459A b) completely meet the criterion of Porb < 6100 s, and are thus good candidates for SQM planets. The periods of two other planets (PSR J1719-14 b and PSR J2051-0827 b) are only slightly larger than the criterion value. They could be regarded as potential candidates. Additionally, we find that the periods of five white dwarf planets (GP Com b, V396 Hya b, J1433 b, WD 0137-349 b, and SDSS J1411+2009 b) are less than 0.1 day; they might also be SQM planets. Gravitational wave emissions from these close-in planetary systems are calculated from the view of various gravitational wave detectors.

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

Journal keyword(s): Gravitational waves - Pulsars - Neutron stars - Exoplanet systems

Simbad objects: 45

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Number of rows : 45
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 WD 0137-349 WD* 01 39 42.8531929464 -34 42 39.577891392 14.60 15.33 15.30     DA3 101 0
2 NAME PSR B0329+54 b Pl 03 32 59.3370698592 +54 34 45.028206408           ~ 2 0
3 PSR B0329+54 Psr 03 32 59.3370698592 +54 34 45.028206408           ~ 690 1
4 PSR J0636+5129 Psr 06 36 04.84645 +51 28 59.9625           ~ 101 0
5 NAME PSR J0636+5129 b Pl? 06 36 04.84645 +51 28 59.9625           ~ 1 0
6 NAME PSR B0943+10 c Pl? 09 46 07.31 +09 51 57.3           ~ 1 0
7 PSR B0943+10 Psr 09 46 07.31 +09 51 57.3           ~ 364 1
8 NAME PSR B0943+10 b Pl? 09 46 07.31 +09 51 57.3           ~ 1 0
9 PSR B1257+12 Psr 13 00 03.1075 +12 40 55.155           ~ 546 1
10 NAME PSR B1257+12d Pl 13 00 03.1075 +12 40 55.155           ~ 36 2
11 NAME PSR B1257+12c Pl 13 00 03.1075 +12 40 55.155           ~ 37 2
12 NAME PSR B1257+12b Pl 13 00 03.1075 +12 40 55.155           ~ 33 2
13 G 61-29 CV* 13 05 42.4009686696 +18 01 03.763561619   16.059 16.101 15.825   DBe 284 0
14 NAME GP Com b Pl? 13 05 42.4009686696 +18 01 03.763561619           ~ 3 0
15 NAME V396 Hya b Pl? 13 12 46.4399548464 -23 21 32.595789924           ~ 3 0
16 V* V396 Hya CV* 13 12 46.4399548464 -23 21 32.595789924   18.9   17.5   DD 114 0
17 SDSS J141126.20+200911.1 ** 14 11 26.2220815704 +20 09 11.039979600           DA+? 49 0
18 PM J14332+1011 CV* 14 33 17.7877088088 +10 11 23.484691356     18.86     ~ 60 0
19 PSR J1446-4701 Psr 14 46 35.709721 -47 01 26.79678           ~ 82 1
20 NAME PSR J1446-4701 b Pl? 14 46 35.7143 -47 01 26.762           ~ 1 0
21 NAME PSR J1502-6752 b Pl? 15 02 18.610 -67 52 16.78           ~ 2 0
22 PSR J1502-6752 Psr 15 02 18.610 -67 52 16.78           ~ 16 1
23 NAME PSR J1544+4937 b Pl? 15 44 04.166 +49 37 57.45           ~ 1 0
24 PSR J1544+4937 Psr 15 44 04.166 +49 37 57.45           ~ 89 1
25 NAME PSR B1620-26 b Pl 16 23 38.2218 -26 31 53.769           ~ 41 1
26 PSR B1620-26 Psr 16 23 38.2218 -26 31 53.769     21.30     ~ 318 2
27 V* HZ Her LXB 16 57 49.8110126616 +35 20 32.486555472 11.90 14.89 13.63 13.88   B3/6ep 2172 0
28 NAME PSR J1719-14b Pl 17 19 10.073 -14 38 00.96           ~ 13 1
29 PSR J1719-14 Psr 17 19 10.076221 -14 38 01.00200           ~ 92 2
30 NAME XTE J1751-305 b Pl? 17 51 13.49 -30 37 23.4           ~ 1 0
31 [KRL2007b] 291 LXB 17 51 13.49 -30 37 23.4           ~ 262 0
32 NAME XTE J1807-294 b Pl? 18 06 59.8 -29 24 30           ~ 1 0
33 [KRL2007b] 304 LXB 18 06 59.8 -29 24 30           ~ 228 0
34 PSR J1807-2459A Psr 18 07 20.36 -24 59 52.6           ~ 30 0
35 NAME PSR J1807-2459A b Pl? 18 07 20.36 -24 59 52.6           ~ 1 0
36 SAX J1808.4-3658 LXB 18 08 27.58 -36 58 43.9           ~ 1051 0
37 GALEX J184038.0+642313 WD* 18 40 37.7911925616 +64 23 12.272542224   18.6   19.4   DA 34 0
38 PSR J1959+2048 Psr 19 59 36.7643141520 +20 48 14.896407996   21.08 20.16 19.53 18.79 G: 854 3
39 NAME PSR J2051-0827 b Pl? 20 51 07.5145 -08 27 37.795           ~ 1 0
40 V* LY Aqr Psr 20 51 07.52058 -08 27 37.6100           ~ 236 2
41 SDSS J222859.93+362359.6 WD* 22 28 59.9311926768 +36 23 59.634736656   16.9   16.7   DA 17 0
42 PSR J2241-5236 Psr 22 41 42.03161 -52 36 36.2492           ~ 143 1
43 NAME PSR J2241-5236b Pl? 22 41 42.03161 -52 36 36.2492           ~ 3 0
44 PSR J2322-2650 Psr 23 22 34.638615 -26 50 58.38398           ~ 35 0
45 NAME PSR J2322-2650 b Pl 23 22 34.64004 -26 50 58.3171           ~ 3 0

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