ETSI Archives

A visual comparison of transmission spectra measured for various planets during transit (red points) and out-oftransit (black points). The p-value of an Anderson-Darling test comparing the two measurements is shown it the title of each sub-figure. The out-of-transit measurements were generated via 1000 bootstrap simulations where the white-light transit signal (see Table 3) was injected at various times of mid-transit and measured the same way as the in-transit data. The top row of planets have a calculated p-value of p < 0.05 indicating the in-transit and out-of-transit data are statistically different from one another. The bottom row of planets have p-values of p > 0.05 indicating they are not statistically dis-similar to the boot-strap simulations. For these planets we additionally compared previous measurements from the Exoplanet Archive with a flat-line using an R 2 metric. We find the previous measurements all have an R 2 < 0.54 which suggests the atmospheric signal is likely consistent with a flat line and the consistency between in-transit and out-of-transit observations may be because the spectra is naturally featureless. -- astro-ph.EP

Ground-Based Reconnaissance Observations Of 21 Exoplanet Atmospheres With The Exoplanet Transmission Spectroscopy Imager

by Keith CowingMarch 17, 2025September 18, 2025

One of the most prolific methods of studying exoplanet atmospheres is transmission spectroscopy, which measures the difference between the depth of an exoplanet’s transit signal at various wavelengths and attempts […]

Section view of the ETSI optics and detectors. The telescope focal plane is to the left of the image. Light enters the collimator and is split into two channels by the multi-chroic which is located at the pupil. Identical prisms disperse the light which is then further filtered to sharpen the transmission cut on/off transitions and imaged with identical cameras onto sCMOS detectors. -- astro-ph.IM

Astronomy & Telescopes, Atmospheres, Climate, Weather, Biogeochemical Cycles & Geobiology, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Status Report

Rapid Characterization Of Exoplanet Atmospheres With The Exoplanet Transmission Spectroscopy Imager (ETSI)

by Keith CowingMarch 11, 2025March 11, 2025

The Exoplanet Transmission Spectroscopy Imager (ETSI) amalgamates a low resolution slitless prism spectrometer with custom multi-band filters to simultaneously image 15 spectral bandpasses between 430 nm and 975 nm with […]

ETSI

Ground-Based Reconnaissance Observations Of 21 Exoplanet Atmospheres With The Exoplanet Transmission Spectroscopy Imager

Rapid Characterization Of Exoplanet Atmospheres With The Exoplanet Transmission Spectroscopy Imager (ETSI)

Astrobiologist Dale Andersen’s Antarctic Field Report: Preview: Fall 2026 Lake Untersee Field Season

Excess Oxygen Stored In Deep Earth Magma May Help Explain How Earth’s Atmosphere Became Oxygen-rich

Using Nuclear Technology To Change How We Explore Icy Ocean Worlds: Examples From Nuclear Powered Mission Concept Designs

Radiation Limits On Amino Acid Preservation And Chiral Measurement At Oxia Planum

Tree of Life Program Targets Publication Of 200 Genome Notes Per Month