Rapidly evolving Galactic plane outbursts in NEOWISE: revisiting the Galactic nova rate with the first all-sky search in the mid-infrared

Zuckerman, Liam; De, Kishalay; Eilers, Anna–Christina; Meisner, Aaron M.; Panagiotou, Christos

doi:10.1093/mnras/stad1625

Cited by 3 publications

(1 citation statement)

References 60 publications

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“…The nova rate is broadly consistent with 28 +5 −4 yr −1 obtained recently by scaling of the M31 nova rate data to the Milky Way [62]. New results for Galactic nova rate of 47.9 +3.1 −8.3 yr −1 in [63] agree with [61] but have a much higher accuracy.…”

Section: Antinovae As Anti-cr Sourcessupporting

confidence: 88%

Antistars as possible sources of antihelium cosmic rays

Bykov

Постнов

Bondar

et al. 2023

J. Cosmol. Astropart. Phys.

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A minor population of antistars in galaxies has been predicted by some of non-standard models of baryogenesis and nucleosynthesis in the early Universe, and their presence is not yet excluded by the currently available observations. Detection of an unusually high abundance of antinuclei in cosmic rays can probe the baryogenesis scenarios in the early Universe. Recent report of the AMS-02 collaboration on the tentative detection of a few antihelium nuclei in GeV cosmic rays provided a great hope on the progress in this issue. We discuss possible sources of antinuclei in cosmic rays from antistars which are predicted in a modified Affleck-Dine baryogenesis scenario by Dolgov and Silk (1993). The model allows us to estimate the expected fluxes and isotopic content of antinuclei in the GeV cosmic rays produced in scenarios involving antistars. We show that the flux of antihelium CRs reported by the AMS-02 experiment can be explained by Galactic anti-nova outbursts, thermonuclear anti-SN Ia explosions, a collection of flaring antistars, or an extragalactic source with abundances not violating existing gamma-ray and microlensing constraints on the antistar population.

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Section: Antinovae As Anti-cr Sourcessupporting

confidence: 88%

Antistars as possible sources of antihelium cosmic rays

Bykov

Постнов

Bondar

et al. 2023

J. Cosmol. Astropart. Phys.

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The most variable VVV sources: eruptive protostars, dipping giants in the nuclear disc and others

Lucas,

Smith,

Guo

et al. 2024

Monthly Notices of the Royal Astronomical Society

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We have performed a comprehensive search of a VISTA Variables in the Via Lactea (VVV) data base of 9.5 yr light curves for variable sources with ΔKs ≥ 4 mag, aiming to provide a large sample of high amplitude eruptive young stellar objects (YSOs) and detect unusual or new types of infrared variable source. We find 222 variable or transient sources in the Galactic bulge and disc, most of which are new discoveries. The sample mainly comprises novae, YSOs, microlensing events, Long Period Variable stars (LPVs), and a few rare or unclassified sources. Additionally, we report the discovery of a significant population of aperiodic late-type giant stars suffering deep extinction events, strongly clustered in the Nuclear Disc of the Milky Way. We suggest that these are metal-rich stars in which radiatively driven mass loss has been enhanced by super-solar metallicity. Among the YSOs, 32/40 appear to be undergoing episodic accretion. Long-lasting YSO eruptions have a typical rise time of ∼2 yr, somewhat slower than the 6–12 month time-scale seen in the few historical events observed on the rise. The outburst durations are usually at least 5 yr, somewhat longer than many lower amplitude VVV events detected previously. The light curves are diverse in nature, suggesting that multiple types of disc instability may occur. Eight long-duration extinction events are seen wherein the YSO dims for a year or more, attributable to inner disc structure. One binary YSO in NGC 6530 displays periodic extinction events (P=59 d) similar to KH 15D.

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Correlated mid-infrared and X-ray outbursts in black hole X-ray binaries: a new route to discovery in infrared surveys

John,

De,

Lucchini

et al. 2024

Monthly Notices of the Royal Astronomical Society

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The mid-infrared (MIR; λ ≃ 3 − 10 μm) bands offer a unique window into understanding accretion and jet formation in Galactic black hole X-ray binaries (BHXRBs). Although difficult to observe from the ground, the NEOWISE survey offers an excellent data set to study MIR variability when combined with contemporaneous X-ray data from MAXI over a ≈15 yr baseline. Using a new difference imaging pipeline for NEOWISE data, we present the first systematic MIR study of BHXRB outbursts. Analyzing a sample of 16 sources, we show variability trends wherein i) the MIR bands are dominated by jet emission during the hard states, constraining the electron power spectrum index (p ≈ 1 − 4) in the optically thin regime and indicating emitting regions of few 10 × gravitational radii when evolving towards a flat spectrum, ii) the MIR luminosity (LIR) scales as $L_{IR} \propto L_X^{0.82\pm 0.12}$ with the 2 − 10 keV X-ray luminosity (LX) in the hard state, consistent with a jet, and iii) thermal disk emission dominates the soft states as the jet switches off and suppresses (≳ 10 ×) the MIR emission into an inverted spectrum (spectral index α ≈ −1). We highlight ‘mini’ outbursts detected in NEOWISE (including two previously unreported episodes of MAXI J1828-249 from September 2015 and September 2016) but missed in MAXI due to their faint fluxes confusion, exhibiting MIR colors suggestive of thermal disk emission. We highlight that upcoming IR surveys and the Rubin observatory will be powerful discovery engines for the distinctively large-amplitude and long-lived outbursts of BHXRBs, as an independent discovery route to X-ray monitors.

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Rapidly evolving Galactic plane outbursts in NEOWISE: revisiting the Galactic nova rate with the first all-sky search in the mid-infrared

Cited by 3 publications

References 60 publications

Antistars as possible sources of antihelium cosmic rays

Antistars as possible sources of antihelium cosmic rays

The most variable VVV sources: eruptive protostars, dipping giants in the nuclear disc and others

Correlated mid-infrared and X-ray outbursts in black hole X-ray binaries: a new route to discovery in infrared surveys

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