TY - JOUR
T1 - Features and prospects for kilonova remnant detection with current and future surveys
AU - Acharya, Sandeep Kumar
AU - Beniamini, Paz
AU - Hotokezaka, Kenta
N1 - Publisher Copyright:
© The Authors 2025.
PY - 2025/1/1
Y1 - 2025/1/1
N2 - We study the observable spectral and temporal properties of kilonova remnants (KNRs) analytically, and point out quantitative differences with respect to supernova remnants. We provide detection prospects of KNRs in the context of ongoing radio surveys. We find that there is a good chance to expect tens of these objects in future surveys with a flux threshold of ∼0.1 mJy. Kilonova remnants from a postulated population of long-lived supermassive neutron star remnants of neutron star mergers are even more likely to be detected, as they are extremely bright and peak earlier. For an ongoing survey with a threshold of ∼1 mJy, we expect to find tens to hundreds of such objects if they are a significant fraction of the total kilonova (KN) population. Considering that there are no such promising KN candidates in presently ongoing surveys, we constrain the fraction of these extreme KN to be no more than 30 percent of the overall KN population. This constraint depends sensitively on the details of ejecta mass and external density distribution.
AB - We study the observable spectral and temporal properties of kilonova remnants (KNRs) analytically, and point out quantitative differences with respect to supernova remnants. We provide detection prospects of KNRs in the context of ongoing radio surveys. We find that there is a good chance to expect tens of these objects in future surveys with a flux threshold of ∼0.1 mJy. Kilonova remnants from a postulated population of long-lived supermassive neutron star remnants of neutron star mergers are even more likely to be detected, as they are extremely bright and peak earlier. For an ongoing survey with a threshold of ∼1 mJy, we expect to find tens to hundreds of such objects if they are a significant fraction of the total kilonova (KN) population. Considering that there are no such promising KN candidates in presently ongoing surveys, we constrain the fraction of these extreme KN to be no more than 30 percent of the overall KN population. This constraint depends sensitively on the details of ejecta mass and external density distribution.
KW - ISM: jets and outflows
KW - ISM: supernova remnants
KW - stars: neutron
UR - http://www.scopus.com/inward/record.url?scp=85214658641&partnerID=8YFLogxK
U2 - 10.1051/0004-6361/202452290
DO - 10.1051/0004-6361/202452290
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AN - SCOPUS:85214658641
SN - 0004-6361
VL - 693
JO - Astronomy and Astrophysics
JF - Astronomy and Astrophysics
M1 - A108
ER -