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Spectroscopy of the first resolved strongly lensed Type Ia supernova iPTF16geu

Johansson, Joel (author)
Uppsala universitet,Stockholms universitet,Fysikum,Oskar Klein-centrum för kosmopartikelfysik (OKC),Uppsala University, Sweden,Institutionen för fysik och astronomi,Stockholm Univ, Albanova Univ Ctr, Oskar Klein Ctr, Phys Dept, SE-10691 Stockholm, Sweden.
Goobar, Ariel (author)
Stockholms universitet,Fysikum,Oskar Klein-centrum för kosmopartikelfysik (OKC),Stockholm Univ, Albanova Univ Ctr, Oskar Klein Ctr, Phys Dept, SE-10691 Stockholm, Sweden.
Price, S. H. (author)
Max Planck Inst Extraterr Phys, Postfach 1312, D-85741 Garching, Germany.
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Carracedo, A. Sagués (author)
Stockholms universitet,Fysikum,Oskar Klein-centrum för kosmopartikelfysik (OKC),Stockholm Univ, Albanova Univ Ctr, Oskar Klein Ctr, Phys Dept, SE-10691 Stockholm, Sweden.
Della Bruna, Lorenza (author)
Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC),Stockholm Univ, AlbaNova Univ Ctr, Oskar Klein Ctr, Dept Astron, SE-10691 Stockholm, Sweden.
Nugent, P. E. (author)
Lawrence Berkeley Natl Lab, 1 Cyclotron Rd, Berkeley, CA 94720 USA.;Univ Calif Berkeley, Dept Astron, 601 Campbell Hall, Berkeley, CA 94720 USA.
Dhawan, Suhail (author)
Stockholms universitet,Fysikum,Oskar Klein-centrum för kosmopartikelfysik (OKC),Stockholm Univ, Albanova Univ Ctr, Oskar Klein Ctr, Phys Dept, SE-10691 Stockholm, Sweden.
Mörtsell, Edvard (author)
Stockholms universitet,Fysikum,Oskar Klein-centrum för kosmopartikelfysik (OKC),Stockholm Univ, Albanova Univ Ctr, Oskar Klein Ctr, Phys Dept, SE-10691 Stockholm, Sweden.
Papadogiannakis, Seméli (author)
Stockholms universitet,Fysikum,Oskar Klein-centrum för kosmopartikelfysik (OKC),Stockholm Univ, Albanova Univ Ctr, Oskar Klein Ctr, Phys Dept, SE-10691 Stockholm, Sweden.
Amanullah, Rahman (author)
Stockholms universitet,Fysikum,Oskar Klein-centrum för kosmopartikelfysik (OKC),Stockholm Univ, Albanova Univ Ctr, Oskar Klein Ctr, Phys Dept, SE-10691 Stockholm, Sweden.
Goldstein, D. (author)
CALTECH, Div Phys Math & Astron, Pasadena, CA 91125 USA.
Cenko, S. B. (author)
NASA, Astrophys Sci Div, Goddard Space Flight Ctr, MC 661, Greenbelt, MD 20771 USA.;Univ Maryland, Joint Space Sci Inst, College Pk, MD 20742 USA.
De, K. (author)
CALTECH, Div Phys Math & Astron, Pasadena, CA 91125 USA.
Dugas, A. (author)
CALTECH, Div Phys Math & Astron, Pasadena, CA 91125 USA.
Kasliwal, M. M. (author)
CALTECH, Div Phys Math & Astron, Pasadena, CA 91125 USA.
Kulkarni, S. R. (author)
CALTECH, Div Phys Math & Astron, Pasadena, CA 91125 USA.
Lunnan, Ragnhild (author)
Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC),Stockholm Univ, AlbaNova Univ Ctr, Oskar Klein Ctr, Dept Astron, SE-10691 Stockholm, Sweden.
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 (creator_code:org_t)
2020-12-16
2021
English.
In: Monthly notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 0035-8711 .- 1365-2966. ; 502:1, s. 510-520
Related links:
https://arxiv.org/ab...
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https://doi.org/10.1...
https://urn.kb.se/re...
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  • Journal article (peer-reviewed)
Abstract Subject headings
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  • We report the results from spectroscopic observations of the multiple images of the strongly lensed Type Ia supernova (SN Ia), iPTF16geu, obtained with ground-based telescopes and the Hubble Space Telescope (HST). From a single epoch of slitless spectroscopy with HST, we resolve spectra of individual lensed supernova images for the first time. This allows us to perform an independent measurement of the time-delay between the two brightest images, Delta t = 1.4 +/- 5.0 d, which is consistent with the time-delay measured from the light curves. We also present measurements of narrow emission and absorption lines characterizing the interstellar medium in the SN Ia host galaxy at z = 0.4087, as well as in the foreground lensing galaxy at z = 0.2163. We detect strong Naid absorption in the host galaxy, indicating that iPTF16geu belongs to a subclass of SNe Ia displaying 'anomalously' large Naid column densities compared to dust extinction derived from light curves. For the lens galaxy, we refine the measurement of the velocity dispersion, sigma = 129 +/- 4 kms(-1), which significantly constrains the lens model. We use ground-based spectroscopy, boosted by a factor similar to 70 from lensing magnification, to study the properties of a high-z SN Ia with unprecedented signal-to-noise ratio. The spectral properties of the supernova, such as pseudo-Equivalent widths of several absorption features and velocities of the Si II-line, indicate that iPTF16geu is a normal SN Ia. We do not detect any significant deviations of the SN spectral energy distribution from microlensing of the SN photosphere by stars and compact objects in the lensing galaxy.

Subject headings

NATURVETENSKAP  -- Fysik (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences (hsv//eng)
NATURVETENSKAP  -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)

Keyword

gravitational lensing: strong
supernovae: general
supernova: individual (iPTF16geu)

Publication and Content Type

ref (subject category)
art (subject category)

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