Faint Rapid Red Transients from Neutron Star - CO White Dwarf Mergers
(2020) In Monthly Notices of the Royal Astronomical Society 493(3). p.3956-3965- Abstract
- Mergers of neutron stars (NS) and white dwarfs (WD) may give rise to observable explosive transientevents. We use 3D hydrodynamical (SPH) simulations, as well as 2D hydrodynamical-thermonuclearsimulations (using the FLASH AMR code) to model the disruption of CO-WDs by NSs, whichproduce faint transient events. We post-process the simulations using a large nuclear network andmake use of the SuperNu radiation-transfer code to predict the observational signatures and detailedproperties of these transients. We calculate the light-curves (LC) and spectra for five models of NS -CO-WD mergers. The small yields of56Ni (few×10−3M) result in faint, rapidly-evolving reddenedtransients (RRTs) with B (R) - peak magnitudes of at most∼−12... (More)
- Mergers of neutron stars (NS) and white dwarfs (WD) may give rise to observable explosive transientevents. We use 3D hydrodynamical (SPH) simulations, as well as 2D hydrodynamical-thermonuclearsimulations (using the FLASH AMR code) to model the disruption of CO-WDs by NSs, whichproduce faint transient events. We post-process the simulations using a large nuclear network andmake use of the SuperNu radiation-transfer code to predict the observational signatures and detailedproperties of these transients. We calculate the light-curves (LC) and spectra for five models of NS -CO-WD mergers. The small yields of56Ni (few×10−3M) result in faint, rapidly-evolving reddenedtransients (RRTs) with B (R) - peak magnitudes of at most∼−12 (−13) to∼−13 (−15), muchshorter and fainter than both regular and faint/peculiar type-Ia SNe. These transients are likely to beaccompanied by several months-long, 1–2 mag dimmer red/IR afterglows. We show that the spectraof RRTs share some similarities with rapidly-evolving transients such as SN2010x, although RRTsare significantly fainter, especially in the I/R bands, and show far stronger Si lines. We estimate thatthe upcoming Large Synoptic Survey Telescope could detect RRTs at a rate of up to∼10−70 yr−1,through observations in the R/I bands. The qualitative agreement between the SPH and FLASHapproaches supports the earlier hydrodynamical studies of these systems. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/01b97715-5e4c-4997-a36d-cb4311d3609d
- author
- Zenati, Yossef ; Bobrick, Alexey LU and Perets, Hagai
- organization
- publishing date
- 2020-04
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Monthly Notices of the Royal Astronomical Society
- volume
- 493
- issue
- 3
- pages
- 10 pages
- publisher
- Oxford University Press
- external identifiers
-
- scopus:85084753244
- ISSN
- 1365-2966
- DOI
- 10.1093/mnras/staa507
- language
- English
- LU publication?
- yes
- id
- 01b97715-5e4c-4997-a36d-cb4311d3609d
- alternative location
- https://ui.adsabs.harvard.edu/abs/2020MNRAS.tmp..475Z/abstract
- date added to LUP
- 2020-03-02 13:47:20
- date last changed
- 2024-04-03 02:29:50
@article{01b97715-5e4c-4997-a36d-cb4311d3609d, abstract = {{Mergers of neutron stars (NS) and white dwarfs (WD) may give rise to observable explosive transientevents. We use 3D hydrodynamical (SPH) simulations, as well as 2D hydrodynamical-thermonuclearsimulations (using the FLASH AMR code) to model the disruption of CO-WDs by NSs, whichproduce faint transient events. We post-process the simulations using a large nuclear network andmake use of the SuperNu radiation-transfer code to predict the observational signatures and detailedproperties of these transients. We calculate the light-curves (LC) and spectra for five models of NS -CO-WD mergers. The small yields of56Ni (few×10−3M) result in faint, rapidly-evolving reddenedtransients (RRTs) with B (R) - peak magnitudes of at most∼−12 (−13) to∼−13 (−15), muchshorter and fainter than both regular and faint/peculiar type-Ia SNe. These transients are likely to beaccompanied by several months-long, 1–2 mag dimmer red/IR afterglows. We show that the spectraof RRTs share some similarities with rapidly-evolving transients such as SN2010x, although RRTsare significantly fainter, especially in the I/R bands, and show far stronger Si lines. We estimate thatthe upcoming Large Synoptic Survey Telescope could detect RRTs at a rate of up to∼10−70 yr−1,through observations in the R/I bands. The qualitative agreement between the SPH and FLASHapproaches supports the earlier hydrodynamical studies of these systems.}}, author = {{Zenati, Yossef and Bobrick, Alexey and Perets, Hagai}}, issn = {{1365-2966}}, language = {{eng}}, number = {{3}}, pages = {{3956--3965}}, publisher = {{Oxford University Press}}, series = {{Monthly Notices of the Royal Astronomical Society}}, title = {{Faint Rapid Red Transients from Neutron Star - CO White Dwarf Mergers}}, url = {{http://dx.doi.org/10.1093/mnras/staa507}}, doi = {{10.1093/mnras/staa507}}, volume = {{493}}, year = {{2020}}, }