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361
Discovery and Timing Analysis of New Pulsars in Globular Cluster NGC 5024: New Observations from FAST
Published 2023-01-01“…The companions, with masses of 0.25, 0.27, and 0.18 M _⊙ , respectively, are likely to be white dwarf stars; if they are extended objects, they do not eclipse the pulsars. …”
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362
A Brown Dwarf Companion to the Nova-like Variable RW Tri
Published 2021-11-01“…The orbital period of Nova-like variable RW Tri is expected to experience a long-term evolution due to a stable mass transfer from the red dwarf to the white dwarf. By adding 297 new eclipse timings obtained from our own observations and a cross-identification of many databases, we fully reinvestigated the variations in orbital period of RW Tri, based on a total of 658 data points spanning over 80 years. …”
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363
The GW Vir Instability Strip in Light of New Observations of PG 1159 Stars: Discovery of Pulsations in the Central Star of A72 and Variability of RX J0122.9–7521
Published 2023-01-01“…We present the results of new time-series photometric observations of 29 pre–white dwarf stars of PG 1159 spectral type, carried out in the years 2014–2022. …”
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364
Weakened Magnetic Braking in the Exoplanet Host Star 51 Peg
Published 2024-01-01Get full text
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365
Ultradeep ATCA Imaging of 47 Tucanae Reveals a Central Compact Radio Source
Published 2024-01-01“…We use radio, X-ray, optical, and UV data to show that explanations involving a background active galactic nucleus, a chromospherically active binary, or a binary involving a white dwarf are unlikely. The most plausible explanations are that the source is an undiscovered millisecond pulsar or a weakly accreting black hole. …”
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366
CHANDRA AND SUZAKU OBSERVATIONS OF THE Be/X-RAY STAR HD110432
Published 2015“…The analysis of the Si XIII and S XV He-like triplets present in the Chandra spectrum points to a very dense (n[subscript e] ~ 10[superscript 13] cm[superscript –3]) plasma located either close to the stellar surface (r < 3R [subscript *]) of the Be star or, alternatively, very close (r ~ 1.5R [subscript WD]) to the surface of a (hypothetical) white dwarf companion. We argue, however, that the available data support the first scenario.…”
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367
High-cadence Timing of Binary Pulsars with CHIME
Published 2024-01-01“…The binary companion to PSR J2023+2853 was found to have a mass of ${0.93}_{-0.14}^{+0.17}$ M _⊙ ; in the context of the near-circular orbit, this mass estimate suggests that the companion to PSR J2023+2853 is likely a high-mass white dwarf. By comparing the timing model obtained for PSR J0218+4232 with previous observations, we found a significant change in the observed orbital period of the system of $\dot{{P}_{{\rm{b}}}}=0.14(2)\times {10}^{-12}$ ; we determined that this variation arises from “Shklovskii acceleration” due to the relative motion of the binary system, and used this measurement to estimate a distance of d = (6.7 ± 1.0) kpc to PSR J0218+4232. …”
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368
The Fast X-Ray Transient XRT 210423 and Its Host Galaxy
Published 2023-01-01“…Possible origins include the tidal disruption of a white dwarf by an intermediate-mass black hole, a supernova shock breakout, or a binary neutron star merger. …”
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369
Constraints on Magnetic Braking from the G8 Dwarf Stars 61 UMa and τ Cet
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370
The Common Envelope Evolution Outcome. II. Short-orbital-period Hot Subdwarf B Binaries Reveal a Clear Picture
Published 2024-01-01“…Short-orbital-period hot subdwarf B star (sdB) plus white dwarf (WD) binaries are the most straightforward samples with which to constrain CEE physics. …”
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371
Value-added Catalog of M-giant Stars in LAMOST DR9
Published 2023-01-01“…The 2471 misclassified non–M-giant stars are white dwarf binaries, early types, and M dwarfs. And the contamination rate is 4.2% in the M-giants sample. …”
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372
SN 2020uem: a Possible Thermonuclear Explosion within a Dense Circumstellar Medium (II). The Properties of the CSM from Polarimetry and Light-curve Modeling
Published 2023-01-01“…As a possible progenitor scenario of SN 2020uem, we propose a white dwarf binary system including an RG, RSG, or AGB star, especially a merger scenario via common envelope evolution, i.e., the core-degenerate scenario or a variant.…”
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373
Missing for 20 yr: MeerKAT Redetects the Elusive Binary Pulsar M30B
Published 2023-01-01“…The massive, undetected companion could either be a massive white dwarf or a neutron star. M30B likely formed as a result of a secondary exchange encounter. …”
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374
The Luminous Type Ia Supernova 2022ilv and Its Early Excess Emission
Published 2023-01-01“…This may be realized in a double-degenerate scenario, wherein a white dwarf merger is preceded by the ejection of a small amount (∼10 ^−3 –10 ^−2 M _⊙ ) of hydrogen and helium-poor tidally stripped material. …”
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375
The RS Oph Outburst of 2021 Monitored in X-Rays with NICER
Published 2023-01-01“…The central supersoft X-ray source (SSS), namely the shell hydrogen burning white dwarf (WD), became visible in the fourth week, initially with short flares. …”
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376
Over 500 Days in the Life of the Photosphere of the Type Iax Supernova SN 2014dt
Published 2023-01-01“…Type Iax supernovae (SNe Iax) are the largest known class of peculiar white dwarf SNe, distinct from normal Type Ia supernovae (SNe Ia). …”
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377
SN 2020udy: A New Piece of the Homogeneous Bright Group in the Diverse Iax Subclass
Published 2024-01-01“…Overall, the observational features of SN 2020udy are consistent with the deflagration of a carbon–oxygen white dwarf.…”
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378
Near-infrared and Optical Nebular-phase Spectra of Type Ia Supernovae SN 2013aa and SN 2017cbv in NGC 5643
Published 2023-01-01“…The time evolution of the NIR [Fe ii ] 1.644 μ m line also indicates moderately high progenitor white dwarf central density and potentially high magnetic fields.…”
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379
SN 2022oqm–A Ca-rich Explosion of a Compact Progenitor Embedded in C/O Circumstellar Material
Published 2024-01-01“…The early behavior can be explained by 10 ^−3 M _⊙ of optically thin circumstellar material (CSM) surrounding either (1) a massive compact progenitor such as a Wolf–Rayet star, (2) a massive stripped progenitor with an extended envelope, or (3) a binary system with a white dwarf. We propose that the early-time light curve is powered by both the interaction of the ejecta with the optically thin CSM and shock cooling (in the massive star scenario). …”
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380
The Green Bank North Celestial Cap Survey. VII. 12 New Pulsar Timing Solutions
Published 2023-01-01“…We present timing solutions for 12 pulsars discovered in the Green Bank North Celestial Cap 350 MHz pulsar survey, including six millisecond pulsars (MSPs), a double neutron star (DNS) system, and a pulsar orbiting a massive white dwarf companion. Timing solutions presented here include 350 and 820 MHz Green Bank Telescope data from initial confirmation and follow-up, as well as a dedicated timing campaign spanning 1 ryr PSR J1122−3546 is an isolated MSP, PSRs J1221−0633 and J1317−0157 are MSPs in black widow systems and regularly exhibit eclipses, and PSRs J2022+2534 and J2039−3616 are MSPs that can be timed with high precision and have been included in pulsar timing array experiments seeking to detect low-frequency gravitational waves. …”
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