2019MNRAS.485.3715B

Query : 2019MNRAS.485.3715B

2019MNRAS.485.3715B - Mon. Not. R. Astron. Soc., 485, 3715-3720 (2019/May-3)

The ultracool helium-atmosphere white dwarf companion of PSR J0740+6620?

BERONYA D.M., KARPOVA A.V., KIRICHENKO A.Y., ZHARIKOV S.V., ZYUZIN D.A., SHIBANOV Y.A. and CABRERA-LAVERS A.

Abstract (from CDS):

We report detection of the likely companion of the binary millisecond pulsar (MSP) J0740+6620 with the Gran Telescopio Canarias in the r' and i' bands. The position of the detected starlike source coincides with the pulsar coordinates within the 1σ uncertainty of ≃0.2 arcsec. Its magnitudes are r' = 26.51 ± 0.17 and i' = 25.49 ± 0.15. Comparing the data with the white dwarf (WD) cooling tracks suggests that it can be an ultracool helium-atmosphere WD with the temperature <=3500 K and cooling age >=5 Gyr. The age is consistent with the pulsar characteristic age corrected for kinematic effects. This is the reddest source among known WD companions of MSPs. Detection of the source in other bands would be useful to clarify its properties and nature.

Journal keyword(s): stars: neutron - pulsars: general - binaries: general - pulsars: individual: PSR J0740+6620

Simbad objects: 16

Full paper

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Number of rows : 16

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Mag I	Sp type	#ref 1850 - 2023	#notes
1	PSR J0337+1715	Psr	03 37 43.82589	+17 15 14.8280						~	84	0
2	[HSH97] WD 0346+246	WD*	03 46 46.5167876352	+24 56 02.665383264		20.13	19.04	18.18		DC	67	1
3	PSR J0348+0432	Psr	03 48 43.6363173480	+04 32 11.461921260						~	235	2
4	PSR J0614-3329	Psr	06 14 10.3479	-33 29 54.116						~	87	1
5	PSR J0621+2514	Psr	06 21 15.2	+25 12 27						~	13	0
6	PSR J0737-3039A	Psr	07 37 51.24720	-30 39 40.6700						~	259	1
7	PSR J0740+6620	Psr	07 40 45.799	+66 20 33.60						~	212	0
8	PSR J0751+1807	Psr	07 51 09.1539	+18 07 38.335						~	272	1
9	PSR J1012+5307	Psr	10 12 33.4345449600	+53 07 02.548542576			19.5			DA	350	1
10	SDSS J110217.48+411315.4	WD*	11 02 17.5223664478	+41 13 21.183965308						DC	20	0
11	EGGR 76	WD*	11 07 59.9504280373	-05 09 26.034289695	12.397	13.093	13.057	13.141	13.215	DA3	153	0
12	PSR J1231-1411	Psr	12 31 11.3069	-14 11 43.628						~	104	0
13	2FGL J1417.5-4404	LXB	14 17 16.80	-44 04 40.5						~	43	0
14	PSR J1915+1606	Psr	19 15 27.99999	+16 06 27.4034			22.5			~	963	1
15	PSR B1937+21	Psr	19 39 39.6	+21 37 22						~	1038	2
16	PSR J2317+1439	Psr	23 17 09.230	+14 39 31.18						~	169	1

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