Quartz Clouds in the Dayside Atmosphere of the Quintessential Hot Jupiter HD 189733 b

Autor: Julie Inglis, Natasha E. Batalha, Nikole K. Lewis, Tiffany Kataria, Heather A. Knutson, Brian M. Kilpatrick, Anna Gagnebin, Sagnick Mukherjee, Maria M. Pettyjohn, Ian J. M. Crossfield, Trevor O. Foote, David Grant, Gregory W. Henry, Maura Lally, Laura K. McKemmish, David K. Sing, Hannah R. Wakeford, Juan C. Zapata Trujillo, Robert T. Zellem

Publikováno v: The Astrophysical Journal Letters, Vol 973, Iss 2, p L41 (2024)

Recent mid-infrared observations with JWST's Mid-Infrared Instrument Low Resolution Spectrometer (MIRI LRS) have resulted in the first direct detections of absorption features from silicate clouds in the transmission spectra of two transiting exoplan

Externí odkaz: https://doaj.org/article/5ee6686a4f5b450e88dba92f98022d33

The Wanderer: Charting WASP-77A b’s Formation and Migration Using a System-wide Inventory of Carbon and Oxygen Abundances

Autor: David R. Coria, Neda Hejazi, Ian J. M. Crossfield, Maleah Rhem

Publikováno v: The Astrophysical Journal, Vol 974, Iss 2, p 151 (2024)

The elemental and isotopic abundances of volatiles like carbon, oxygen, and nitrogen may trace a planet’s formation location relative to H _2 O, CO _2 , CO, NH _3 , and N _2 “snowlines,” or the distance from the star at which these volatile ele

Externí odkaz: https://doaj.org/article/04fdc6fd18b24c4d833aca9520c0cadc

The California Legacy Survey. V. Chromospheric Activity Cycles in Main-sequence Stars

Autor: Howard Isaacson, Andrew W. Howard, Benjamin Fulton, Erik A. Petigura, Lauren M. Weiss, Stephen R. Kane, Brad Carter, Corey Beard, Steven Giacalone, Judah Van Zandt, Joseph M. Akana Murphy, Fei Dai, Ashley Chontos, Alex S. Polanski, Malena Rice, Jack Lubin, Casey Brinkman, Ryan A. Rubenzahl, Sarah Blunt, Samuel W. Yee, Mason G. MacDougall, Paul A. Dalba, Dakotah Tyler, Aida Behmard, Isabel Angelo, Daria Pidhorodetska, Andrew W. Mayo, Rae Holcomb, Emma V. Turtelboom, Michelle L. Hill, Luke G. Bouma, Jingwen Zhang, Ian J. M. Crossfield, Nicholas Saunders

Publikováno v: The Astrophysical Journal Supplement Series, Vol 274, Iss 2, p 35 (2024)

We present optical spectroscopy of 710 solar neighborhood stars collected over 20 years to catalog chromospheric activity and search for stellar activity cycles. The California Legacy Survey stars are amenable to exoplanet detection using precise rad

Externí odkaz: https://doaj.org/article/2c03ecb495854f57adf7e6f7fe8cd7ea

High-resolution Elemental Abundance Measurements of Cool JWST Planet Hosts Using AutoSpecFit: An Application to the Sub-Neptune K2-18b’s Host M Dwarf

Autor: Neda Hejazi, Ian J. M. Crossfield, Diogo Souto, Jonathan Brande, Thomas Nordlander, Emilio Marfil, Katia Cunha, David R. Coria, Zachary G. Maas, Alex S. Polanski, Natalie R. Hinkel, Joseph E. Hand

Publikováno v: The Astrophysical Journal, Vol 973, Iss 1, p 31 (2024)

We present an in-depth, high-resolution spectroscopic analysis of the M dwarf K2-18, which hosts a sub-Neptune exoplanet in its habitable zone. We show our technique to accurately normalize the observed spectrum, which is crucial for a proper spectra

Externí odkaz: https://doaj.org/article/13afc9c616fc45589589256a99aa81c0

An Earth-sized Planet on the Verge of Tidal Disruption

Autor: Fei Dai, Andrew W. Howard, Samuel Halverson, Jaume Orell-Miquel, Enric Pallé, Howard Isaacson, Benjamin Fulton, Ellen M. Price, Mykhaylo Plotnykov, Leslie A. Rogers, Diana Valencia, Kimberly Paragas, Michael Greklek-McKeon, Jonathan Gomez Barrientos, Heather A. Knutson, Erik A. Petigura, Lauren M. Weiss, Rena Lee, Casey L. Brinkman, Daniel Huber, Gumundur Stefánsson, Kento Masuda, Steven Giacalone, Cicero X. Lu, Edwin S. Kite, Renyu Hu, Eric Gaidos, Michael Zhang, Ryan A. Rubenzahl, Joshua N. Winn, Te Han, Corey Beard, Rae Holcomb, Aaron Householder, Gregory J. Gilbert, Jack Lubin, J. M. Joel Ong, Alex S. Polanski, Nicholas Saunders, Judah Van Zandt, Samuel W. Yee, Jingwen Zhang, Jon Zink, Bradford Holden, Ashley Baker, Max Brodheim, Ian J. M. Crossfield, William Deich, Jerry Edelstein, Steven R. Gibson, Grant M. Hill, Sharon R Jelinsky, Marc Kassis, Russ R. Laher, Kyle Lanclos, Scott Lilley, Joel N. Payne, Kodi Rider, Paul Robertson, Arpita Roy, Christian Schwab, Abby P. Shaum, Martin M. Sirk, Chris Smith, Adam Vandenberg, Josh Walawender, Sharon X. Wang, Shin-Ywan (Cindy) Wang, Edward Wishnow, Jason T. Wright, Sherry Yeh, José A. Caballero, Juan C. Morales, Felipe Murgas, Evangelos Nagel, Ansgar Reiners, Andreas Schweitzer, Hugo M. Tabernero, Mathias Zechmeister, Alton Spencer, David R. Ciardi, Catherine A. Clark, Michael B. Lund, Douglas A. Caldwell, Karen A. Collins, Richard P. Schwarz, Khalid Barkaoui, Cristilyn Watkins, Avi Shporer, Norio Narita, Akihiko Fukui, Gregor Srdoc, David W. Latham, Jon M. Jenkins, George R. Ricker, Sara Seager, Roland Vanderspek

Publikováno v: The Astronomical Journal, Vol 168, Iss 3, p 101 (2024)

TOI-6255 b (GJ 4256) is an Earth-sized planet (1.079 ± 0.065 R _⊕ ) with an orbital period of only 5.7 hr. With the newly commissioned Keck Planet Finder and CARMENES spectrographs, we determine the planet’s mass to be 1.44 ± 0.14 M _⊕ . The

Externí odkaz: https://doaj.org/article/0984db33703e4dd29fc69e546aaae69a