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Two c's in a pod: Cosmology independent measurement of the Type Ia supernova colour-luminosity relation with a sibling pair

Biswas, Rahul and Goobar, Ariel and Dhawan, Suhail and Schulze, Steve and Johansson, Joel and Bellm, Eric C. and Dekany, Richard and Drake, Andrew J. and Duev, Dmitry A. and Fremling, Christoffer and Graham, Matthew and Kim, Young-Lo and Kool, Erik C. and Kulkarni, Shrinivas R. and Mahabal, Ashish A. and Perley, Daniel and Rigault, Mickael and Rusholme, Ben and Sollerman, Jesper and Shupe, David L. and Smith, Matthew and Walters, Richard S. (2021) Two c's in a pod: Cosmology independent measurement of the Type Ia supernova colour-luminosity relation with a sibling pair. . (Unpublished) https://resolver.caltech.edu/CaltechAUTHORS:20210520-150000950

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Abstract

Using Zwicky Transient Facility (ZTF) observations, we identify a pair of "sibling" Type Ia supernovae (SNe Ia), i.e., hosted by the same galaxy at z = 0.0541. They exploded within 200 days from each other at a separation of 0.6″ corresponding to a projected distance of only 0.6 kpc. Performing SALT2 light curve fits to the gri ZTF photometry, we show that for these equally distant "standardizable candles", there is a difference of 2 magnitudes in their rest frame B-band peaks, and the fainter SN has a significantly red SALT2 colour c=0.57± 0.04, while the stretch values x1 of the two SNe are similar, suggesting that the fainter SN is attenuated by dust in the interstellar medium of the host galaxy. We use these measurements to infer the SALT2 colour standardization parameter, β = 3.5 ± 0.3, independent of the underlying cosmology and Malmquist bias. Assuming the colour excess is entirely due to dust, the result differs by 2σ from the average Milky-Way total-to-selective extinction ratio, but is in good agreement with the colour-brightness corrections empirically derived from the most recent SN Ia Hubble-Lemaitre diagram fits. Thus we suggest that SN "siblings", which will increasingly be discovered in the coming years, can be used to probe the validity of the colour and lightcurve shape corrections using in SN Ia cosmology while avoiding important systematic effects in their inference from global multi-parameter fits to inhomogeneous data-sets, and also help constrain the role of interstellar dust in SN Ia cosmology.


Item Type:Report or Paper (Discussion Paper)
Related URLs:
URLURL TypeDescription
http://arxiv.org/abs/2103.16978arXivDiscussion Paper
ORCID:
AuthorORCID
Biswas, Rahul0000-0002-5741-7195
Goobar, Ariel0000-0002-4163-4996
Dhawan, Suhail0000-0002-2376-6979
Schulze, Steve0000-0001-6797-1889
Johansson, Joel0000-0001-5975-290X
Bellm, Eric C.0000-0001-8018-5348
Dekany, Richard0000-0002-5884-7867
Duev, Dmitry A.0000-0001-5060-8733
Fremling, Christoffer0000-0002-4223-103X
Graham, Matthew0000-0002-3168-0139
Kim, Young-Lo0000-0002-1031-0796
Kool, Erik C.0000-0002-7252-3877
Kulkarni, Shrinivas R.0000-0001-5390-8563
Mahabal, Ashish A.0000-0003-2242-0244
Perley, Daniel0000-0001-8472-1996
Rigault, Mickael0000-0002-8121-2560
Rusholme, Ben0000-0001-7648-4142
Sollerman, Jesper0000-0003-1546-6615
Shupe, David L.0000-0003-4401-0430
Smith, Matthew0000-0003-0103-8820
Walters, Richard S.0000-0002-1835-6078
Additional Information:RB was supported by the research project grant "Understanding the Dynamic Universe" funded by the Knut and Alice Wallenberg Foundation under Dnr KAW2018.0067. AG acknowledges support from the Swedish Research Council under Dnr VR 2016-03274 and 2020-03444. SD acknowledges support from the Isaac Newton Trust and the Kavli Foundation through Newton-Kavli fellowship. MR, MS and YLK have received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (grant agreement n°759194 - USNAC). ECK acknowledges support from the G.R.E.A.T research environment funded by Vetenskapsrådet, the Swedish Research Council, under project number 2016-06012, and support from The Wenner-Gren Foundations. Based on observations obtained with the Samuel Oschin Telescope 48-inch and the 60-inch Telescope at the Palomar Observatory as part of the Zwicky Transient Facility project. ZTF is supported by the National Science Foundation under Grant No. AST-1440341 and a collaboration including Caltech, IPAC, theWeizmann Institute for Science, the Oskar Klein Center at Stockholm University, the University of Maryland, the University of Washington, Deutsches Elektronen-Synchrotron and Humboldt University, Los Alamos National Laboratories, the TANGO Consortium of Taiwan, the University of Wisconsin at Milwaukee, and Lawrence Berkeley National Laboratories. Operations are conducted by COO, IPAC, and UW. The ZTF forced-photometry service was funded under the Heising-Simons Foundation grant. This work was supported by the GROWTH project funded by the National Science Foundation under Grant No 1545949. Based on observations obtained with the Samuel Oschin Telescope 48-inch and the 60-inch Telescope at the Palomar Observatory as part of the Zwicky Transient Facility project. ZTF is supported by the National Science Foundation under Grant No. AST-2034437 and a collaboration including Caltech, IPAC, the Weizmann Institute for Science, the Oskar Klein Centre at Stockholm University, theUniversity of Maryland, Deutsches Elektronen-Synchrotron and Humboldt University, the TANGO Consortium of Taiwan, the University ofWisconsin at Milwaukee, Trinity College Dublin, Lawrence Livermore National Laboratories, and IN2P3, France. Operations are conducted by COO, IPAC, and UW. Based on observations made with the Nordic Optical Telescope, operated by the Nordic Optical Telescope Scientific Association at the Observatorio del Roque de los Muchachos, La Palma, Spain, of the Instituto de Astrofisica de Canarias. software: Numpy (van der Walt et al. 2011), Astropy (Astropy Collaboration et al. 2013, 2018), sncosmo (Barbary et al. 2016), PhotUtils (Bradley et al. 2019), ZTFQuery (Rigault 2018), SWARP (Bertin 2010), HOTPANTS (Becker 2015), ZUDS, fringez (Medford et al. 2021), LAMBDAR Wright et al. (2016), Prospector (Leja et al. 2017), emcee (Foreman-Mackey et al. 2013), pygtc (Bocquet & Carter 2016), matplotlib (Hunter 2007), IPAC forced Photometry Service.
Group:Astronomy Department, Infrared Processing and Analysis Center (IPAC), Zwicky Transient Facility
Funders:
Funding AgencyGrant Number
Knut and Alice Wallenberg FoundationKAW2018.0067
Swedish Research Council2016-03274
Swedish Research Council2020-03444
Isaac Newton TrustUNSPECIFIED
Kavli FoundationUNSPECIFIED
European Research Council (ERC)759194
G.R.E.A.T. Research EnvironmentUNSPECIFIED
Swedish Research Council2016-06012
Wenner-Gren FoundationsUNSPECIFIED
NSFAST-1440341
ZTF partner institutionsUNSPECIFIED
Heising-Simons FoundationUNSPECIFIED
NSFOISE-1545949
NSFAST-2034437
Subject Keywords:AT 2019lcj, SN 2020aewj, dust, extinction, observations
Record Number:CaltechAUTHORS:20210520-150000950
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20210520-150000950
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:109219
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:24 May 2021 17:48
Last Modified:24 May 2021 17:48

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