@Article{HosseinzadehCGVNMBCPFSSABBCCCELLPPRTW:2019:FoNeSt,
author = "Hosseinzadeh, G. and Cowperthwaite, P. S. and Gomez, S. and
Villar, V. A. and Nicholl, M. and Margutti, R. and Berger, E. and
Chornock, R. and Paterson, K. and Fong, W. and Savchenko, V. and
Short, P. and Alexander, K. D. and Blanchard, P. K. and Braga,
Jo{\~a}o and Calkins, M. L. and Cartier, R. and Coppejans, D. L.
and Eftekhari, T. and Laskar, T. and Ly, C. and Patton, L. and
Pelisoli, I. and Reichart, D. E. and Terreran, G. and Williams, P.
K. G.",
affiliation = "{Harvard \& Smithsonian} and {Observatories of the Carnegie
Institute for Science} and {Harvard \& Smithsonian} and {Harvard
\& Smithsonian} and {University of Edinburgh} and {Northwestern
University} and {Harvard \& Smithsonian} and {Ohio University}
and {Northwestern University} and {Northwestern University} and
{University of Geneva} and {University of Edinburgh} and
{Northwestern University} and {Harvard \& Smithsonian} and
{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Harvard
\& Smithsonian} and {National Optical Astronomy Observatory} and
{Northwestern University} and {Harvard \& Smithsonian} and
{University of Bath} and {University of Arizona} and {Harvard \&
Smithsonian} and {Universit{\"a}t Potsdam} and {University of
North Carolina} and {Northwestern University} and {Harvard \&
Smithsonian}",
title = "Follow-up of the neutron star bearing gravitational-wave candidate
events S190425z and S190426c with MMT and SOAR",
journal = "Astrophysical Journal Letters",
year = "2019",
volume = "880",
number = "1",
pages = "L4",
month = "July",
keywords = "binaries: close, gravitational waves, methods: observational,
stars: black holes, stars: neutron.",
abstract = "On 2019 April 25.346 and 26.640 UT the Laser Interferometer
Gravitational-Wave Observatory (LIGO) and Virgo gravitational-wave
(GW) observatory announced the detection of the first candidate
events in Observing Run 3 that contained at least one neutron star
(NS). S190425z is a likely binary neutron star (BNS) merger at
d(L) = 156 +/- 41 Mpc, while S190426c is possibly the first
NS-black hole (BH) merger ever detected, at d(L) = 377 +/- 100
Mpc, although with marginal statistical significance. Here we
report our optical follow-up observations for both events using
the MMT 6.5 m telescope, as well as our spectroscopic follow-up of
candidate counterparts (which turned out to be unrelated) with the
4.1 m SOAR telescope. We compare to publicly reported searches,
explore the overall areal coverage and depth, and evaluate those
in relation to the optical/near-infrared (NIR) kilonova emission
from the BNS merger GW170817, to theoretical kilonova models, and
to short gamma-ray burst (SGRB) afterglows. We find that for a
GW170817-like kilonova, the partial volume covered spans up to
about 40% for S190425z and 60% for S190426c. For an on-axis jet
typical of SGRBs, the search effective volume is larger, but such
a configuration is expected in at most a few percent of mergers.
We further find that wide-field gamma-ray and X-ray limits rule
out luminous on-axis SGRBs, for a large fraction of the
localization regions, although these searches are not sufficiently
deep in the context of the gamma-ray emission from GW170817 or
off-axis SGRB afterglows. The results indicate that some optical
follow-up searches are sufficiently deep for counterpart
identification to about 300 Mpc, but that localizations better
than 1000 deg(2) are likely essential.",
doi = "10.3847/2041-8213/ab271c",
url = "http://dx.doi.org/10.3847/2041-8213/ab271c",
issn = "2041-8205 and 2041-8213",
language = "en",
targetfile = "hosseinzadeh_follow.pdf",
urlaccessdate = "21 maio 2024"
}