optical reflectance spectra Archives

Graphical Abstract. Created in BioRender. Liistro, E. (2026) https://BioRender.com/j2de4ay

Biochemistry & Organic Chemistry, Biophysics, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Plant Biology, Status Report

Is Constitutive Red-shift An Advantage For Oxygenic Photosynthesis Under M-dwarf Starlight? Insights From Acaryochloris marina sp. str. Moss Beach

by Keith CowingApril 29, 2026April 29, 2026

In the next years, several space missions will search for evidence of life on exoplanets, focusing on robust biosignatures associated with oxygenic photosynthesis, including atmospheric oxygen accumulation and the Vegetation […]

Optical reflectance spectra of 2004 GV9. Panel A: Here we compare our new GMOS reflectance spectra of 2004 GV9 both to each other and to coarse spectra derived from published single-epoch photometry (Rabinowitz et al. 2008; DeMeo et al. 2009; Fraser et al. 2015; Tegler et al. 2016). Hollow points in the GMOS spectra are either affected by incomplete background subtraction, telluric band residuals, proximity to the GMOS chip gaps, or a combination of these effects. All datasets are scaled to unit reflectance at 0.625 µm. We present all spectra calibrated with HD 124523 overlaid for direct comparison, and also offset for clarity. All offset spectra are offset vertically in increments of +0.2. Panel B: Here we show our 2004 GV9 spectra following division by a line fitted to them across their full wavelength coverage. Spectra from each epoch are offset vertically for clarity in increments of +0.1. Only spectra calibrated with HD 124523 are shown. Points affected by residuals of telluric absorption or imperfect background subtraction have been omitted. -- astro-ph.EP

Astrochemistry, Astrogeology, Astronomy & Telescopes, Comets and Asteroids, Imaging & Spectroscopy, Meteorites & Asteroids, Status Report

Hunting for Hydrated Minerals on Trans-Neptunian Objects

by Keith CowingDecember 20, 2023December 20, 2023

We present new optical reflectance spectra of three potentially silicate-rich Trans-Neptunian Objects (TNOs). These spectra were obtained with the aim of confirming past hints and detections of 0.7 micron absorption […]