Synthetic Population of Binary Cepheids. II. The Effect of Companion Light on the Extragalactic Distance Scale
Because of their period–luminosity relation (PLR), classical Cepheids play a key role in the calibration of the extragalactic distance scale and the determination of the Hubble–Lemaître constant H _0 . Recent findings show that the majority of classical Cepheids should be in binary or multiple syste...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2023-01-01
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| Series: | The Astrophysical Journal |
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| Online Access: | https://doi.org/10.3847/1538-4357/acc845 |
| _version_ | 1797695804793683968 |
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| author | Paulina Karczmarek Gergely Hajdu Grzegorz Pietrzyński Wolfgang Gieren Weronika Narloch Radosław Smolec Grzegorz Wiktorowicz Krzysztof Belczynski |
| author_facet | Paulina Karczmarek Gergely Hajdu Grzegorz Pietrzyński Wolfgang Gieren Weronika Narloch Radosław Smolec Grzegorz Wiktorowicz Krzysztof Belczynski |
| author_sort | Paulina Karczmarek |
| collection | DOAJ |
| description | Because of their period–luminosity relation (PLR), classical Cepheids play a key role in the calibration of the extragalactic distance scale and the determination of the Hubble–Lemaître constant H _0 . Recent findings show that the majority of classical Cepheids should be in binary or multiple systems, which might undermine their accuracy, as the extra—and unaccounted for—light from the companions of Cepheids causes a shift in the PLR. We quantify this shift using synthetic populations of binary Cepheids that we developed for this purpose, as described in Paper I of this series. We find that while all PLRs are shifted toward brighter values due to the excess light from the companions, the bias in the relative distance modulus between two galaxies hosting binary Cepheids can be either positive or negative, depending on the percentage of binary Cepheids in them. If the binarity percentage in the two galaxies is similar, the effect of binarity is canceled. Otherwise, it introduces a shift in the distance modulus of the order of millimagnitudes in the near-infrared passbands and Wesenheit indices, and tens of millimagnitudes in the visual domain; its exact value depends on the variant of the synthetic population (a unique combination of metallicity, star formation history, shape and location of the instability strip, and initial parameter distributions). Such shifts in the distance moduli to Type Ia supernova host galaxies introduce an additional statistical error on H _0 , which however does not prevent measuring H _0 with a precision of 1%. |
| first_indexed | 2024-03-12T03:17:29Z |
| format | Article |
| id | doaj.art-d7f1e5f4337544369a1df9a9d873b4ea |
| institution | Directory Open Access Journal |
| issn | 1538-4357 |
| language | English |
| last_indexed | 2024-03-12T03:17:29Z |
| publishDate | 2023-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal |
| spelling | doaj.art-d7f1e5f4337544369a1df9a9d873b4ea2023-09-03T14:08:59ZengIOP PublishingThe Astrophysical Journal1538-43572023-01-01950218210.3847/1538-4357/acc845Synthetic Population of Binary Cepheids. II. The Effect of Companion Light on the Extragalactic Distance ScalePaulina Karczmarek0https://orcid.org/0000-0002-0136-0046Gergely Hajdu1https://orcid.org/0000-0003-0594-9138Grzegorz Pietrzyński2https://orcid.org/0000-0002-9443-4138Wolfgang Gieren3https://orcid.org/0000-0003-1405-9954Weronika Narloch4https://orcid.org/0000-0003-2335-2060Radosław Smolec5https://orcid.org/0000-0001-7217-4884Grzegorz Wiktorowicz6https://orcid.org/0000-0001-6106-0515Krzysztof Belczynski7https://orcid.org/0000-0002-1658-7681Departamento de Astronomía, Universidad de Concepción , Casilla 160-C, Concepción, Chile ; pkarczmarek@astro-udec.cl; Nicolaus Copernicus Astronomical Center , Bartycka 18, 00-716 Warsaw, PolandNicolaus Copernicus Astronomical Center , Bartycka 18, 00-716 Warsaw, PolandNicolaus Copernicus Astronomical Center , Bartycka 18, 00-716 Warsaw, PolandDepartamento de Astronomía, Universidad de Concepción , Casilla 160-C, Concepción, Chile ; pkarczmarek@astro-udec.clDepartamento de Astronomía, Universidad de Concepción , Casilla 160-C, Concepción, Chile ; pkarczmarek@astro-udec.clNicolaus Copernicus Astronomical Center , Bartycka 18, 00-716 Warsaw, PolandNicolaus Copernicus Astronomical Center , Bartycka 18, 00-716 Warsaw, PolandNicolaus Copernicus Astronomical Center , Bartycka 18, 00-716 Warsaw, PolandBecause of their period–luminosity relation (PLR), classical Cepheids play a key role in the calibration of the extragalactic distance scale and the determination of the Hubble–Lemaître constant H _0 . Recent findings show that the majority of classical Cepheids should be in binary or multiple systems, which might undermine their accuracy, as the extra—and unaccounted for—light from the companions of Cepheids causes a shift in the PLR. We quantify this shift using synthetic populations of binary Cepheids that we developed for this purpose, as described in Paper I of this series. We find that while all PLRs are shifted toward brighter values due to the excess light from the companions, the bias in the relative distance modulus between two galaxies hosting binary Cepheids can be either positive or negative, depending on the percentage of binary Cepheids in them. If the binarity percentage in the two galaxies is similar, the effect of binarity is canceled. Otherwise, it introduces a shift in the distance modulus of the order of millimagnitudes in the near-infrared passbands and Wesenheit indices, and tens of millimagnitudes in the visual domain; its exact value depends on the variant of the synthetic population (a unique combination of metallicity, star formation history, shape and location of the instability strip, and initial parameter distributions). Such shifts in the distance moduli to Type Ia supernova host galaxies introduce an additional statistical error on H _0 , which however does not prevent measuring H _0 with a precision of 1%.https://doi.org/10.3847/1538-4357/acc845Astronomical simulationsDetached binary starsDelta Cepheid variable starsCepheid distanceMilky Way GalaxyLarge Magellanic Cloud |
| spellingShingle | Paulina Karczmarek Gergely Hajdu Grzegorz Pietrzyński Wolfgang Gieren Weronika Narloch Radosław Smolec Grzegorz Wiktorowicz Krzysztof Belczynski Synthetic Population of Binary Cepheids. II. The Effect of Companion Light on the Extragalactic Distance Scale The Astrophysical Journal Astronomical simulations Detached binary stars Delta Cepheid variable stars Cepheid distance Milky Way Galaxy Large Magellanic Cloud |
| title | Synthetic Population of Binary Cepheids. II. The Effect of Companion Light on the Extragalactic Distance Scale |
| title_full | Synthetic Population of Binary Cepheids. II. The Effect of Companion Light on the Extragalactic Distance Scale |
| title_fullStr | Synthetic Population of Binary Cepheids. II. The Effect of Companion Light on the Extragalactic Distance Scale |
| title_full_unstemmed | Synthetic Population of Binary Cepheids. II. The Effect of Companion Light on the Extragalactic Distance Scale |
| title_short | Synthetic Population of Binary Cepheids. II. The Effect of Companion Light on the Extragalactic Distance Scale |
| title_sort | synthetic population of binary cepheids ii the effect of companion light on the extragalactic distance scale |
| topic | Astronomical simulations Detached binary stars Delta Cepheid variable stars Cepheid distance Milky Way Galaxy Large Magellanic Cloud |
| url | https://doi.org/10.3847/1538-4357/acc845 |
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