NExtUP: the Normal-incidence Extreme Ultraviolet Photometer

Jeremy J. Drake; Peter Cheimets; Cecilia Garraffo; Bradford Wargelin; Allison Youngblood; Vinay L. Kashyap; Paola Testa; David Caldwell; James Mason; Brian Fleming; Kevin France; Scott Wolk; Oswald Siegmund; Tommi Koskinen; Julian Alvarado-Gomez; Maria Mercedes Lopez-Morales; Guillaume Gronoff; Jay Bookbinder; Martin Barstow; David Windt; Randy Gladstone; Christopher Loghry; Rix Yarbrough

doi:10.1117/12.2594408

24 August 2021 NExtUP: the Normal-incidence Extreme Ultraviolet Photometer

Jeremy J. Drake, Peter Cheimets, Cecilia Garraffo, Bradford Wargelin, Allison Youngblood, Vinay L. Kashyap, Paola Testa, David Caldwell, James Mason, Brian Fleming, Kevin France, Scott Wolk, Oswald Siegmund, Tommi Koskinen, Julian Alvarado-Gomez, Maria Mercedes Lopez-Morales, Guillaume Gronoff, Jay Bookbinder, Martin Barstow, David Windt, Randy Gladstone, Christopher Loghry, Rix Yarbrough

Author Affiliations +

Proceedings Volume 11821, UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XXII; 1182108 (2021) https://doi.org/10.1117/12.2594408
Event: SPIE Optical Engineering + Applications, 2021, San Diego, California, United States

Abstract

The Normal-incidence Extreme Ultraviolet Photometer (NExtUP) is a smallsat mission concept designed to measure the EUV radiation conditions of exoplanet host stars, and F-M type stars in general. EUV radiation is absorbed at high altitude in a planetary atmosphere, in the exosphere and upper thermosphere, where the gas can be readily heated to escape temperatures. EUV heating and ionization are the dominant atmospheric loss drivers during most of a planet’s life. There are only a handful of accurately measured EUV stellar fluxes, all dating from Extreme Ultraviolet Explorer (EUVE) observations in the ‘90s. Consequently, current models of stellar EUV emission are uncertain by more than an order of magnitude and dominate uncertainties in planetary atmospheric loss models. NExtUP will use periodic and aperiodic multilayers on off-axis parabolic mirrors and a prime focus microchannel plate detector to image stars in 5 bandpasses between 150 and 900°A down to flux limits two orders of magnitude lower than reached by EUVE. NExtUP may also accomplish a compelling array of secondary science goals, including using line-of-sight absorption measurements to understand the structure of the local interstellar medium, and imaging EUV emission from energetic processes on solar system objects at unprecedented spatial resolution. NExtUP is well within smallsat weight limits, requires no special orbital conditions, and would be flown on a spacecraft supplied by MOOG Industries. It draws on decades of mission heritage expertise at SAO and LASP, including similar instruments successfully launched and operated to observe the Sun.

Conference Presentation

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Jeremy J. Drake, Peter Cheimets, Cecilia Garraffo, Bradford Wargelin, Allison Youngblood, Vinay L. Kashyap, Paola Testa, David Caldwell, James Mason, Brian Fleming, Kevin France, Scott Wolk, Oswald Siegmund, Tommi Koskinen, Julian Alvarado-Gomez, Maria Mercedes Lopez-Morales, Guillaume Gronoff, Jay Bookbinder, Martin Barstow, David Windt, Randy Gladstone, Christopher Loghry, and Rix Yarbrough "NExtUP: the Normal-incidence Extreme Ultraviolet Photometer", Proc. SPIE 11821, UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XXII, 1182108 (24 August 2021); https://doi.org/10.1117/12.2594408

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