J/ApJ/866/83 Opt/NIR obs. of 1FGLJ1417.7-4407 neutron star bin. (Swihart+, 2018)
A multiwavelength view of the neutron star binary 1FGL J1417.7-4407 a progenitor
to canonical millisecond pulsars.
Swihart S.J., Strader J., Shishkovsky L., Chomiuk L., Bahramian A.,
Heinke C.O., Miller-Jones J.C.A., Edwards P.G., Cheung C.C.
<Astrophys. J., 866, 83-83 (2018)>
=2018ApJ...866...83S 2018ApJ...866...83S (SIMBAD/NED BibCode)
ADC_Keywords: Binaries, X-ray; Stars, neutron; Pulsars; Photometry, UBVRI;
Gamma rays
Keywords: binaries: spectroscopic; pulsars: general; radio continuum: general
X-rays: binaries; X-rays: general
Abstract:
The Fermi γ-ray source 1FGL J1417.7-4407 (J1417) is a compact
X-ray binary with a neutron star primary and a red giant companion in
a ∼5.4 days orbit. This initial conclusion, based on optical and X-ray
data, was confirmed when a 2.66ms radio pulsar was found at the same
location (and with the same orbital properties) as the optical/X-ray
source. However, these initial studies found conflicting evidence
about the accretion state and other properties of the binary. We
present new optical, radio, and X-ray observations of J1417 that allow
us to better understand this unusual system. We show that one of the
main pieces of evidence previously put forward for an accretion
disk-the complex morphology of the persistent Hα emission
line-can be better explained by the presence of a strong, magnetically
driven stellar wind from the secondary and its interaction with the
pulsar wind. The radio spectral index derived from VLA/ATCA
observations is broadly consistent with that expected from a
millisecond pulsar, further disfavoring an accretion disk scenario.
X-ray observations show evidence for a double-peaked orbital light
curve, similar to that observed in some redback millisecond pulsar
binaries and likely due to an intrabinary shock. Refined optical
light-curve fitting gives a distance of 3.1±0.6kpc, confirmed by a
Gaia DR2 parallax measurement. At this distance the X-ray luminosity
of J1417 is (1.0-0.3+0.4)x1033erg/s, which is more luminous than
all known redback systems in the rotational-powered pulsar state,
perhaps due to the wind from the giant companion. The unusual
phenomenology of this system and its differing evolutionary path from
redback millisecond pulsar binaries points to a new eclipsing pulsar
"spider" subclass that is a possible progenitor of normal field
millisecond pulsar binaries.
Description:
Strader+ (2015ApJ...804L..12S 2015ApJ...804L..12S) analyzed a 2ks Chandra/ACIS-I exposure
of the 1FGL field taken in 2011 February (ObsID 12843; PI Ricci). The
neutron star binary discussed in this work (1FGL J1417.7-4407) was the
only significant X-ray source in the field.
To achieve improved constraints on the short-term X-ray variability,
as well as an improved spectrum, we obtained a single, uninterrupted
∼50ks Chandra exposure of J1417 (ObsID 17786; PI Strader) on 2016 June 6
using the ACIS-S3 CCD configured in FAINT mode.
We observed J1417 with the Karl G. Jansky Very Large Array (VLA) under
program VLA/15A-491 (PI Strader). Observations were obtained over four
epochs during 2015 June/July. Also, we observed J1417 with the
Australia Telescope Compact Array (ATCA) on 2015 October 24, a few
months after our VLA observations, under program ID CX336 (PI Miller-Jones).
We have continued occasional spectroscopic monitoring of J1417 with
the Goodman spectrograph on the SOAR telescope, obtaining 10 epochs of
spectroscopy from 2015 June 23 to 2017 September 01 (UT).
We obtained optical BVI and near-IR H photometry of 1FGL J1417.7-4407
using ANDICAM on the SMARTS 1.3m telescope at CTIO roughly every night
between 25 July and 19 September 2017 (UT). On each night, we took
200, 90, and 50 second exposures in B, V, and I bands, respectively.
Objects:
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RA (ICRS) DE Designation(s)
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14 17 16.80 -44 04 40.5 1FGL J1417.7-4407 = 3FGL J1417.5-4402
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table5.dat 26 136 SMARTS photometry of 3FGL J1417.5-4402
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See also:
II/183 : UBVRI Photometric Standards (Landolt 1992)
VIII/76 : Leiden/Argentine/Bonn (LAB) Survey of Galactic HI (Kalberla+ 2005)
I/347 : Distances to 1.33 billion stars in Gaia DR2 (Bailer-Jones+, 2018)
J/MNRAS/273/411 : Multifrequency fluxes of 280 pulsars (Lorimer+ 1995)
J/A+AS/147/195 : Pulsar spectra of radio emission (Maron+, 2000)
J/AJ/131/1044 : Chromospherically active stars in the Bulge (Drake, 2006)
J/ApJ/709/241 : X-rays sources in NGC 6397 (Bogdanov+, 2010)
J/MNRAS/428/2500 : GX 339-4 radio/X-ray flux correlation (Corbel+, 2013)
J/MNRAS/432/1294 : Fermi unassociated sources ATCA observations (Petrov+, 2013)
J/ApJS/218/23 : Fermi LAT third source catalog (3FGL) (Acero+, 2015)
J/ApJ/831/89 : Eclipsing LMXB in 3FGL J0427.9-6704 center (Strader+, 2016)
J/ApJ/838/139 : Radio follow-up on 3FGL unassociated sources (Schinzel+, 2017)
J/ApJ/851/31 : 2FGL J0846.0+2820 opt. counterpart follow-up (Swihart+, 2017)
Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 11 F11.6 d BJD Barycentric Julian Date of observation,
BJD-2450000
13 A1 --- Band Broadband filter (B, V, I or H)
15- 20 F6.3 mag omag Apparent magnitude in Band
22- 26 F5.3 mag e_omag Magnitude error, 1-sigma
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 04-Oct-2019