The Pandora SmallSat: Multiwavelength Characterization of Exoplanets and their Host Stars


Pandora's optical system fulfills the sensitivity requirements and provides simultaneous multiwavelength capabilities in a compact, low-complexity design. Visible light is reflected off a dichroic coating on the front surface of the prism, and a focusing parabola brings the visible light to the visible channel detector. NIR light is dispersed through a prism to the infrared detector. Internal and external baffles (not shown) provide off-axis light supression.

Pandora is a SmallSat mission designed to study the atmospheres of exoplanets, and was selected as part of NASA's Astrophysics Pioneers Program.

Transmission spectroscopy of transiting exoplanets provides our best opportunity to identify the makeup of planetary atmospheres in the coming decade.

Stellar brightness variations due to star spots, however, can impact these measurements and contaminate the observed spectra. Pandora's goal is to disentangle star and planet signals in transmission spectra to reliably determine exoplanet atmosphere compositions. Pandora will collect long-duration photometric observations with a visible-light channel and simultaneous spectra with a near-IR channel. The broad-wavelength coverage will provide constraints on the spot and faculae covering fractions of low-mass exoplanet host stars and the impact of these active regions on exoplanetary transmission spectra. Pandora will subsequently identify exoplanets with hydrogen- or water-dominated atmospheres, and robustly determine which planets are covered by clouds and hazes. Pandora will observe at least 20 exoplanets with sizes ranging from Earth-size to Jupiter-size and host stars spanning mid-K to late-M spectral types.

The project is made possible by leveraging investments in other projects, including an all-aluminum 0.45-meter Cassegrain telescope design, and a NIR sensor chip assembly from the James Webb Space Telescope. The mission will last five years from initial formulation to closeout, with one-year of science operations. Launch is planned for the mid-2020s as a secondary payload in Sun-synchronous low-Earth orbit. By design, Pandora has a diverse team, with over half of the mission leadership roles filled by early career scientists and engineers, demonstrating the high value of SmallSats for developing the next generation of space mission leaders.

Elisa V. Quintana, Knicole D. Colón, Gregory Mosby, Joshua E. Schlieder, Pete Supsinskas, Jordan Karburn, Jessie L. Dotson, Thomas P. Greene, Christina Hedges, Dániel Apai, Thomas Barclay, Jessie L. Christiansen, Néstor Espinoza, Susan E. Mullally, Emily A. Gilbert, Kelsey Hoffman}, Veselin B. Kostov, Nikole K. Lewis, Trevor O. Foote, James Mason, Allison Youngblood, Brett M. Morris, Elisabeth R. Newton, Joshua Pepper, Benjamin V. Rackham, Jason F. Rowe, Kevin Stevenson

Comments: Presented at the 35th Annual Small Satellite Conference
Subjects: Instrumentation and Methods for Astrophysics (astro-ph.IM); Earth and Planetary Astrophysics (astro-ph.EP)
Journal reference: Quintana, E. V., et al. 2021, "The Pandora SmallSat: Multiwavelength Characterization of Exoplanets and their Host Stars", Proceedings of the Small Satellite Conference, Science/Mission Payloads, SSC21-VI-02
Cite as: arXiv:2108.06438 [astro-ph.IM] (or arXiv:2108.06438v1 [astro-ph.IM] for this version)
Submission history
From: Elisa Quintana
[v1] Sat, 14 Aug 2021 01:35:22 UTC (12,041 KB)
https://arxiv.org/abs/2108.06438
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