Galactic Extinction: How Many Novae Does it Hide and How Does it Affect the Galactic Nova Rate?

Abstract

There is a longstanding discrepancy between the observed Galactic classical nova rate of $\sim 10$ yr${}^{-1}$ and the predicted rate from Galactic models of $\sim 30$--50 yr${}^{-1}$. One explanation for this discrepancy is that many novae are hidden by interstellar extinction, but the degree to which dust can obscure novae is poorly constrained. We use newly available all-sky three-dimensional dust maps to compare the brightness and spatial distribution of known novae to that predicted from relatively simple models in which novae trace Galactic stellar mass. We find that only half ($\sim 48$\%) of novae are expected to be easily detectable ($g\lesssim 15$) with current all-sky optical surveys such as the All-Sky Automated Survey for Supernovae (ASAS-SN). This fraction is much lower than previously estimated, showing that dust does substantially affect nova detection in the optical. By comparing complementary survey results from ASAS-SN, OGLE-IV, and the Palomar Gattini IR-survey in the context of our modeling, we find a tentative Galactic nova rate of $\sim 40$ yr${}^{-1}$, though this could decrease to as low as $\sim 30$ yr${}^{-1}$ depending on the assumed distribution of novae within the Galaxy. These preliminary estimates will be improved in future work through more sophisticated modeling of nova detection in ASAS-SN and other surveys.

15 pages, 9 figures

References in corpus (30)

• SciPy 1.0--Fundamental Algorithms for Scientific Computing in Python
• The NumPy array: a structure for efficient numerical computation
• Binary companions of evolved stars in APOGEE DR14: Search method and catalog of ~5,000 companions
• The Man Behind the Curtain: X-rays Drive the UV through NIR Variability in the 2013 AGN Outburst in NGC 2617
• The Galaxy in Context: Structural, Kinematic and Integrated Properties
• A 3D Dust Map Based on Gaia, Pan-STARRS 1 and 2MASS
• VISTA Variables in the Via Lactea (VVV): The public ESO near-IR variability survey of the Milky Way
• Detection of the gravitational redshift in the orbit of the star S2 near the Galactic centre massive black hole
• Modelling the Galactic Interstellar Extinction Distribution in Three Dimensions
• A Three-Dimensional Map of Milky-Way Dust
• A three-dimensional Galactic extinction model
• The Milky Way total mass profile as inferred from Gaia DR2
• On Galactic density modeling in the presence of dust extinction
• Observing the Next Galactic Supernova
• Large Synoptic Survey Telescope: Overview
• Interstellar Extinction Curve Variations Toward the Inner Milky Way: A Challenge to Observational Cosmology
• Classical novae from the POINT-AGAPE microlensing survey of M31 -- II. Rate and statistical characteristics of the nova population
• The Distances to Novae As Seen By Gaia
• The Galactic Nova Rate Revisited
• Observations of Galactic and Extragalactic Novae
• BK Lyncis: The Oldest Old Nova?... And a Bellwether for Cataclysmic-Variable Evolution
• Palomar Gattini-IR: Survey overview, data processing system, on-sky performance and first results
• A parametric description of the 3D structure of the Galactic Bar/Bulge using the VVV survey
• Nova Scorpius 1437 A.D. is now a dwarf nova, age-dated by its proper motion
• A population of heavily reddened, optically missed novae from Palomar Gattini-IR: Constraints on the Galactic nova rate
• The ASAS-SN Bright Supernova Catalog -- IV. 2017
• Classical-Nova Contribution to the Milky Way's ${}^{26}$Al Abundance: Exit Channel of the Key ${}^{25}$Al($p,\gamma$)${}^{26}$Si Resonance
• The UBV Color Evolution of Classical Novae. I. Nova-Giant Sequence in the Color-Color Diagram
• OGLE Atlas of Classical Novae I. Galactic Bulge Objects
• Classical Novae Masquerading as Dwarf Novae? Outburst Properties of Cataclysmic Variables with ASAS-SN

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