Transmission spectroscopy of WASP-52 b with JWST NIRISS: Water and helium atmospheric absorption, alongside prominent star-spot crossings

Monthly Notices of the Royal Astronomical Society (2025) staf489

Authors:

Marylou Fournier-Tondreau, Yanbo Pan, Kim Morel, David Lafrenière, Ryan J MacDonald, Louis-Philippe Coulombe, Romain Allart, Loïc Albert, Michael Radica, Caroline Piaulet-Ghorayeb, Pierre-Alexis Roy, Stefan Pelletier, Lisa Dang, René Doyon, Björn Benneke, Nicolas B Cowan, Antoine Darveau-Bernier, Olivia Lim, Étienne Artigau, Doug Johnstone, Lisa Kaltenegger, Jake Taylor, Laura Flagg

Transit ephemerides and timing variations from Kepler and K2 to TESS

Monthly Notices of the Royal Astronomical Society 538:4 (2025) 2283-2310

Authors:

Laurel Kaye, Suzanne Aigrain

Limits on the atmospheric metallicity and aerosols of the sub-Neptune GJ 3090 b from high-resolution CRIRES+ spectroscopy

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) (2025) staf469

Authors:

Luke T Parker, João M Mendonça, Hannah Diamond-Lowe, Jayne L Birkby, Annabella Meech, Sophia R Vaughan, Matteo Brogi, Chloe Fisher, Lars A Buchhave, Aaron Bello-Arufe, Laura Kreidberg, Jason Dittmann

Limits on the atmospheric metallicity and aerosols of the sub-Neptune GJ 3090 b from high-resolution CRIRES+ spectroscopy

(2025)

Authors:

Luke T Parker, João M Mendonça, Hannah Diamond-Lowe, Jayne L Birkby, Annabella Meech, Sophia R Vaughan, Matteo Brogi, Chloe Fisher, Lars A Buchhave, Aaron Bello-Arufe, Laura Kreidberg, Jason Dittmann

On unveiling buried nuclei with JWST: A technique for hunting the most obscured galaxy nuclei from local to high redshift

Astronomy & Astrophysics EDP Sciences 696 (2025) ARTN A135

Authors:

I Garcia-Bernete, Fr Donnan, D Rigopoulou, M Pereira-Santaella, E Gonzalez-Alfonso, N Thatte, S Aalto, S Konig, M Maksymowicz-Maciata, Mw R Smith, J-S Huang, Ge Magdis, Pf Roche, J Devriendt, A., Slyz

Abstract:

We analyze JWST NIRSpec+MIRI/MRS observations of the infrared (IR) polycyclic aromatic hydrocarbon (PAH) features in the central regions (a at 6 μm; a 440 pc depending on the source) of local luminous IR galaxies. In this work, we examine the effect of nuclear obscuration on the PAH features of deeply obscured nuclei, predominantly found in local luminous IR galaxies, and we compare these nuclei with astar-forming regions. We extend previous work to include shorter wavelength PAH ratios now available with the NIRSpec+MIRI/MRS spectral range. We introduce a new diagnostic diagram for selecting deeply obscured nuclei based on the 3.3 and 6.2 μm PAH features and/or mid-IR continuum ratios at a3 and 5 μm. We find that the PAH equivalent width ratio of the brightest PAH features at shorter wavelengths (at 3.3 and 6.2 μm) is impacted by nuclear obscuration. Although the sample of luminous IR galaxies used in this analysis is relatively small, we find that sources exhibiting a high silicate absorption feature cluster tightly in a specific region of the diagram, whereas star-forming regions experiencing lower extinction levels occupy a different area in the diagram. This demonstrates the potential of this technique to identify buried nuclei. To leverage the excellent sensitivity of the MIRI imager on board JWST, we extend our method of identifying deeply obscured nuclei at higher redshifts using a selection of MIRI filters. Specifically, the combination of various MIRI JWST filters enables the identification of buried sources beyond the local Universe and up to za 3, where other commonly used obscuration tracers such as the 9.7 μm silicate band, are out of the spectral range of MRS. Our results pave the way for identifying distant deeply obscured nuclei with JWST.