SIMBAD references

2015MNRAS.448..376N - Mon. Not. R. Astron. Soc., 448, 376-389 (2015/March-3)

The companion candidate near Fomalhaut - a background neutron star?


Abstract (from CDS):

The directly detected planetary mass companion candidate close to the young, nearby star Fomalhaut is a subject of intense discussion. While the detection of common proper motion led to the interpretation as Jovian-mass companion, later non-detections in the infrared raised doubts. Recent astrometric measurements indicate a belt crossing or highly eccentric orbit for the object, if a companion, making the planetary interpretation potentially even more problematic. In this study we discuss the possibility of Fomalhaut b being a background object with a high proper motion. By analysing the available photometric and astrometric data of the object, we show that they are fully consistent with a neutron star: neutron stars are faint, hot (blue), and fast moving. Neutron stars with an effective temperature of the whole surface area being 112 000-126 500 K (with small to negligible extinction) at a distance of roughly 11pc (best fit) would be consistent with all observables, namely with the photometric detections in the optical, with the upper limits in the infrared and X-rays, as well as with the astrometry (consistent with a distances of 11pc or more and high proper motion as typical for neutron stars) and non-detection of pulsation (not beamed). We consider the probability of finding an unrelated object or even a neutron star nearby and mostly co-aligned in proper motion with Fomalhaut A and come to the conclusion that this is definitely well possible.

Abstract Copyright: © 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2015)

Journal keyword(s): stars: individual: Fomalhaut - stars: neutron - planetary systems

Nomenclature: Fig. 2: [NHG2015] Source N (Nos 1-2).

CDS comments: p.387: 2FGL J2258.9-2759 is a probable misprint for 2FGL J2258.0-2759.

Simbad objects: 20

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