Predicting the self-lensing population in optical surveys

The vast majority of binaries containing a compact object and a regular star spend most of their time in a quiescent state where no strong interactions occur between components. Detection of these binaries is extremely challenging and only few candidates have been detected through optical spectroscopy. Self-lensing represents a new means of detecting compact objects in binaries, where gravitational lensing of the light from the visible component by the compact object produces periodic optical flares. Here we show that current and planned large-area optical surveys can detect a significant number (∼100–10 000s) of these self-lensing binaries and provide insights into the properties of the compact lenses. We show that many of the predicted population of observable self-lensing binaries will be observed with multiple self-lensing flares; this both improves the chances of detection and also immediately distinguishes them from chance-alignment micro-lensing events. Through self-lensing we can investigate long – but previously hidden – stages of binary evolution and consequently provide new constraints on evolutionary models that impact the number and nature of double compact object mergers.

Note:

11 pages, 6 figures, 3 tables

binaries: general
stars: black holes
stars: neutron
gravitational lensing: micro
methods: numerical

References(40)

Figures(6)

GW190814: Gravitational Waves from the Coalescence of a 23 Solar Mass Black Hole with a 2.6 Solar Mass Compact Object

LIGO Scientific and
Virgo

Collaborations

•

R. Abbott
(
- LIGO Lab., Caltech
)

et al.

- Astrophys.J.Lett. 896 (2020) 2, L44
•
e-Print:
- 2006.12611
•
DOI:
- 10.3847/2041-8213/ab960f

Microlensing of large sources

Eric Agol
(
- Caltech
)

- Astrophys.J. 594 (2003) 449-455
•
e-Print:
- astro-ph/0303457
•
DOI:
- 10.1086/376833

Compact object modeling with the startrack population synthesis code

Krzystof Belczynski
(
- New Mexico State U.
)
,
Vassiliki Kalogera
(
- Northwestern U.
)
,
Frederic A. Rasio
(
- Northwestern U.
)
,
Ronald E. Taam
(
- Northwestern U.
)
,
Andreas Zezas
(
- Harvard-Smithsonian Ctr. Astrophys.
)

et al.

- Astrophys.J.Suppl. 174 (2008) 223
•
e-Print:
- astro-ph/0511811
•
DOI:
- 10.1086/521026

Missing Black Holes Unveil The Supernova Explosion Mechanism

- Astrophys.J. 757 (2012) 91
•
e-Print:
- 1110.1635
•
DOI:
- 10.1088/0004-637X/757/1/91

Evolutionary roads leading to low effective spins, high black hole masses, and O1/O2 rates for LIGO/Virgo binary black holes

K. Belczynski
(
- Warsaw, Copernicus Astron. Ctr.
)
,
J. Klencki
(
- Nijmegen U., IMAPP
)
,
C.E. Fields
(
- Michigan State U.
)
,
A. Olejak
(
- Warsaw U. Observ. and
- Warsaw, CFT
)
,
E. Berti
(
- Johns Hopkins U.
)

et al.

- Astron.Astrophys. 636 (2020) A104
•
e-Print:
- 1706.07053
•
DOI:
- 10.1051/0004-6361/201936528

A Be-type star with a black-hole companion

J. Casares
(
- IAC, La Laguna and
- Laguna U., Tenerife
)
,
I. Negueruela
(
- Alicante U.
)
,
M. Ribo
(
- Barcelona, IEEC
)
,
I. Ribas
(
- ICE, Bellaterra
)
,
J.M. Paredes
(
- Barcelona, IEEC
)

et al.

- Nature 505 (2014) 378-381
•
e-Print:
- 1401.3711
•
DOI:
- 10.1038/nature12916

Chen Y.

- Astron.Astrophys. 632 (2019) A105
•
DOI:
- 10.1051/0004-6361/201936612

Periodic self-lensing from accreting massive black hole binaries

- Mon.Not.Roy.Astron.Soc. 474 (2018) 3, 2975-2986
•
e-Print:
- 1707.02335
•
DOI:
- 10.1093/mnras/stx2936

Detecting Gravitational Self Lensing from Stellar-Mass Binaries Composed of Black Holes or Neutron Stars

- Mon.Not.Roy.Astron.Soc. 491 (2020) 1, 1506-1517,
- Monthly Notices of the Royal Astronomical Society, Volume 491, Issue 1, p.1506-1517, January 2020
•
e-Print:
- 1906.11149
•
DOI:
- 10.1093/mnras/stz3086

Gravitational microlensing by rotating stars

Habib Ebrahimnejad Rahbari
(
- Tehran U.
)
,
Mohammad Nouri-Zononz
(
- Tehran U. and
- IPM, Tehran
)
,
Sohrab Rahvar
(
- Sharif U. of Tech. and
- IPM, Tehran
)

e-Print:
- astro-ph/0508477

Most Black Holes are Born Very Slowly Rotating

- Astrophys.J.Lett. 881 (2019) 1, L1
•
e-Print:
- 1907.03714
•
DOI:
- 10.3847/2041-8213/ab339b

A period-dependent spatial scatter of Galactic black hole transients

et al.

- Mon.Not.Roy.Astron.Soc. 496 (2020) 1, L22-L27
•
e-Print:
- 2002.00871
•
DOI:
- 10.1093/mnrasl/slaa081

Selflensing by binaries

Andrew Gould
(
- Ohio State U.
)

- Astrophys.J. 446 (1995) 541
•
e-Print:
- astro-ph/9409057
•
DOI:
- 10.1086/175812

Searching for failed supernovae with astrometric binaries

- Astrophys.J. 572 (2002) 944-949
•
e-Print:
- astro-ph/0111512
•
DOI:
- 10.1086/340435

Harper G. M.
,
Brown A.
,
Guinan E. F.
,
O'Gorman E.
,
Richards A.M. S.

et al.

- Astron.J. 154 (2017) 11
•
DOI:
- 10.3847/1538-3881/aa6ff9

A self-lensing binary massive black hole interpretation of quasi-periodic eruptions

- Mon.Not.Roy.Astron.Soc. 503 (2021) 2, 1703-1716,
- Mon.Not.Roy.Astron.Soc. 504 (2021) 4, 5512 (erratum)
•
e-Print:
- 2103.00017
•
DOI:
- 10.1093/mnras/stab609