Dr. Jakob Nordin

Dr. Nordin erforscht Typ-Ia-Supernovae als Präzisionsinstrumente für die Kosmologie und arbeitet an ihrer Standardisierung als zuverlässige Entfernungsmesser im Universum. Sein aktueller Fokus liegt auf der Analyse großer, homogener Supernova-Stichproben aus dem Zwicky Transient Facility (ZTF)-Survey, um systematische Unsicherheiten zu verstehen und zu korrigieren — insbesondere die Abhängigkeit ihrer Leuchtkraft von Umgebungseigenschaften und spektralen Merkmalen. Er entwickelt dabei auch automatisierte Klassifikationsmethoden für Transientenströme und arbeitet an neuen spektrophotometrischen Standardisierungstechniken. Für Observatorien und Vermessungsprojekte bietet sein Ansatz Methoden zur präziseren Messung kosmischer Entfernungen und zur automatisierten Verarbeitung großer Datenmengen aus modernen Time-Domain-Surveys; relevant ist dies für Grundlagenforschung in Kosmologie und für die Vorbereitung auf zukünftige Großteleskope wie das Vera Rubin Observatory.

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• Test der zeitlichen Entwicklung der Dunkle Energie mit Supernovae in massereichen Galaxienhaufen bei z> 1

  Quelle ↗

  Förderer: Bundesministerium für Wirtschaft und Energie Zeitraum: 07/2015 - 06/2018 Projektleitung: Dr. Jakob Nordin

• HST-Beobachtungen der Wirtsgalaxie-Umgebung von Typ Ia Supernovae für Präzisionskosmologie

  Quelle ↗

  Förderer: Bundesministerium für Wirtschaft und Energie Zeitraum: 07/2016 - 12/2018 Projektleitung: Prof. Dr. Marek Kowalski, Dr. Jakob Nordin

• Astrophysics Center for Multimessenger Studies in Europe (ACME)

  Quelle ↗

  Förderer: Horizon Europe: Research and Innovation Action (RIA) Zeitraum: 09/2024 - 08/2028 Projektleitung: Dr. Jakob Nordin, Prof. Dr. Marek Kowalski

• The Zwicky Transient Facility: System Overview, Performance, and First Results

  2018

  Publications of the Astronomical Society of the Pacific · DOI

  The Zwicky Transient Facility (ZTF) is a new optical time-domain survey that uses the Palomar 48 inch Schmidt telescope. A custom-built wide-field camera provides a 47 deg 2 field of view and 8 s readout time, yielding more than an order of magnitude improvement in survey speed relative to its predecessor survey, the Palomar Transient Factory. We describe the design and implementation of the camera and observing system. The ZTF data system at the Infrared Processing and Analysis Center provides near-real-time reduction to identify moving and varying objects. We outline the analysis pipelines, data products, and associated archive. Finally, we present on-sky performance analysis and first scientific results from commissioning and the early survey. ZTF's public alert stream will serve as a useful precursor for that of the Large Synoptic Survey Telescope.

• SPECTRA AND<i>HUBBLE SPACE TELESCOPE</i>LIGHT CURVES OF SIX TYPE Ia SUPERNOVAE AT 0.511 &lt;<i>z</i>&lt; 1.12 AND THE UNION2 COMPILATION

  2010

  The Astrophysical Journal · DOI

  We report on work to increase the number of well-measured Type Ia supernovae (SNe Ia) at high redshifts. Light curves, including high signal-to-noise Hubble Space Telescope data, and spectra of six SNe Ia that were discovered during 2001, are presented. Additionally, for the two SNe with z > 1, we present ground-based J-band photometry from Gemini and the Very Large Telescope. These are among the most distant SNe Ia for which ground-based near-IR observations have been obtained. We add these six SNe Ia together with other data sets that have recently become available in the literature to the Union compilation. We have made a number of refinements to the Union analysis chain, the most important ones being the refitting of all light curves with the SALT2 fitter and an improved handling of systematic errors. We call this new compilation, consisting of 557 SNe, the Union2 compilation. The flat concordance CDM model remains an excellent fit to the Union2 data with the best-fit constant equation-of-state parameter w = -0.997 +0.050 -0.054 (stat) +0.077 -0.082 (stat + sys together) for a flat universe, or w = -1.038 +0.056 -0.059 (stat) +0.093 -0.097 (stat + sys together) with curvature. We also present improved constraints on w(z). While no significant change in w with redshift is detected, there is still considerable room for evolution in w. The strength of the constraints depends strongly on redshift. In particular, at z 1, the existence and nature of dark energy are only weakly constrained by the data.