2017ApJ...841...98P


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.21CEST14:41:20

2017ApJ...841...98P - Astrophys. J., 841, 98-98 (2017/June-1)

Radio pulse search and X-ray monitoring of SAX J1808.4-3658: what causes its orbital evolution?

PATRUNO A., JAODAND A., KUIPER L., BULT P., HESSELS J.W.T., KNIGGE C., KING A.R., WIJNANDS R. and VAN DER KLIS M.

Abstract (from CDS):

The accreting millisecond X-ray pulsar SAX J1808.4-3658 shows a peculiar orbital evolution that proceeds at a very fast pace. It is important to identify the underlying mechanism responsible for this behavior because it can help to understand how this system evolves and which physical processes (such as mass loss or spin-orbit coupling) are occurring in the binary. It has also been suggested that, when in quiescence, SAX J1808.4-3658 turns on as a radio pulsar, a circumstance that might provide a link between accreting millisecond pulsars and black-widow (BW) radio pulsars. In this work, we report the results of a deep radio pulsation search at 2 GHz using the Green Bank Telescope in 2014 August and an X-ray study of the 2015 outburst with Chandra, Swift XRT, and INTEGRAL. In quiescence, we detect no radio pulsations and place the strongest limit to date on the pulsed radio flux density of any accreting millisecond pulsar. We also find that the orbit of SAX J1808.4-3658 continues evolving at a fast pace. We compare the orbital evolution of SAX J1808.4-3658 to that of several other accreting and nonaccreting binaries, including BWs, redbacks, cataclysmic variables, black holes, and neutron stars in low-mass X-ray binaries. We discuss two possible scenarios: either the neutron star has a large moment of inertia and is ablating the donor, generating mass loss with an efficiency of 40%, or the donor star has a strong magnetic field of at least 1 kG and is undergoing quasi-cyclic variations due to spin-orbit coupling.

Abstract Copyright: © 2017. The American Astronomical Society. All rights reserved.

Journal keyword(s): binaries: general - stars: individual: SAX J1808.4-3658 - stars: neutron - stars: rotation - X-rays: binaries - X-rays: stars - X-rays: stars

Simbad objects: 26

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Number of rows : 26

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 V* V1037 Cas LXB 00 29 03.06 +59 34 19.0           ~ 236 1
2 1A 0620-00 HXB 06 22 44.5420315454 -00 20 44.289428950 10.60 11.40 11.2     K3V-K7V 1046 0
3 V* UY Vol LXB 07 48 33.71 -67 45 07.7 16.10 17.00 16.9 16.7 17.05 ~ 575 0
4 NOVA Pyx 1890 No* 09 04 41.5062068236 -32 22 47.503345173   7.0       ~ 382 1
5 PSR J1023+0038 LXB 10 23 47.6840307966 +00 38 41.006983532     17.31     GV 314 0
6 V* KV UMa HXB 11 18 10.7922353051 +48 02 12.319175505     12.25     K5V-M1V 726 0
7 XSS J12270-4859 LXB 12 27 58.7475950389 -48 53 42.826034125           ~ 208 0
8 4U 1323-62 LXB 13 26 36.31 -62 08 09.9           ~ 164 0
9 NOVA Nor 1920 No* 15 39 26.465 -52 19 17.99           ~ 76 0
10 V* NN Ser No* 15 52 56.1202658103 +12 54 44.432043501     16.51     DAO1+M4 233 0
11 V* HZ Her LXB 16 57 49.8110797681 +35 20 32.487435684 11.90 14.89 13.63 13.88   B3/6ep 1929 0
12 MXB 1658-298 LXB 17 02 06.54 -29 56 44.1 18.35 18.75 18.3     ~ 328 0
13 [KRL2007b] 225 LXB 17 10 12.3 -28 07 54           ~ 77 0
14 PSR J1723-2837 Psr 17 23 23.1937238648 -28 37 57.211292603   16.81 15.77 15.71   ~ 57 0
15 PSR J1731-18 Psr 17 31 17.6072 -18 47 32.740           ~ 26 1
16 [SKM2002] 27 LXB 17 45 35.65 -29 01 34.0           ~ 156 1
17 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11758 0
18 [PLV2002] CX1 LXB 17 48 52.163 -20 21 32.40           ~ 169 1
19 NGC 6440 GlC 17 48 52.67 -20 21 34.5   12.01 10.10     ~ 471 1
20 V* V4580 Sgr LXB 18 08 27.54 -36 58 44.3   16.81 16.51     ~ 880 0
21 PSR J1824-2452A Psr 18 24 32.009 -24 52 11.10           ~ 435 2
22 V* V691 CrA LXB 18 25 46.8186056396 -37 06 18.529015318 14.30 15.20 15.1     ~ 400 0
23 V* V1405 Aql LXB 19 18 47.871 -05 14 17.09 20.90 21.40 21.0     ~ 442 0
24 PSR J1959+2048 Psr 19 59 36.7480 +20 48 14.599   20.4       ~ 706 2
25 V* LY Aqr Psr 20 51 07.5145 -08 27 37.795           ~ 167 2
26 PSR J2339-0533 Psr 23 39 38.7410542334 -05 33 05.108159666     18.48     ~ 82 0

    Equat.    Gal    SGal    Ecl

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2020.10.21-14:41:20

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