The Compositions of Rocky Planets in Close-in Orbits Tend to be Earth-Like

Autor: Brinkman, Casey L., Weiss, Lauren M., Huber, Daniel, Lee, Rena A., Kolecki, Jared, Tenn, Gwyneth, Zhang, Jingwen, Narayanan, Suchitra, Polanski, Alex S., Dai, Fei, Bean, Jacob L., Beard, Corey, Brady, Madison, Brodheim, Max, Brown, Matt, Deich, William, Edelstein, Jerry, Fulton, Benjamin J., Giacalone, Steven, Gibson, Steven R., Gilbert, Gregory J., Halverson, Samuel, Handley, Luke, Hill, Grant M., Holcomb, Rae, Holden, Bradford, Householder, Aaron, Howard, Andrew W., Isaacson, Howard, Kaye, Stephen, Laher, Russ R., Lanclos, Kyle, Ong, J. M. Joel, Payne, Joel, Petigura, Eric A., Pidhorodetska, Daria, Poppett, Claire, Roy, Arpita, Rubenzahl, Ryan, Saunders, Nicholas, Schwab, Christian, Seifahrt, Andreas, Shaum, Abby P., Sirk, Martin M., Smith, Chris, Smith, Roger, Stefánsson, Guðmundur, Stürmer, Julian, Thorne, Jim, Turtelboom, Emma V., Tyler, Dakotah, Valliant, John, Van Zandt, Judah, Walawender, Josh, Yee, Samuel W., Yeh, Sherry, Zink, Jon

Hundreds of exoplanets between 1-1.8 times the size of the Earth have been discovered on close in orbits. However, these planets show such a diversity in densities that some appear to be made entirely of iron, while others appear to host gaseous enve

Externí odkaz: http://arxiv.org/abs/2410.00213

The $\sim$50-Myr-Old TOI-942c is Likely on an Aligned, Coplanar Orbit and Losing Mass

Autor: Teng, Huan-Yu, Dai, Fei, Howard, Andrew W., Isaacson, Howard, Rubenzahl, Ryan A., Angelo, Isabel, Polanski, Alex S.

We report the observation of the transiting planet TOI-942c, a Neptunian planet orbiting a young K-type star approximately 50 Myr years old. Using Keck/HIRES, we observed a partial transit of the planet and detected an associated radial velocity anom

Externí odkaz: http://arxiv.org/abs/2408.07788

An Earth-sized Planet on the Verge of Tidal Disruption

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

TOI-6255~b (GJ 4256) is an Earth-sized planet (1.079$\pm0.065$ $R_\oplus$) with an orbital period of only 5.7 hours. With the newly commissioned Keck Planet Finder (KPF) and CARMENES spectrographs, we determined the planet's mass to be 1.44$\pm$0.14

Externí odkaz: http://arxiv.org/abs/2407.21167

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

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

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

Externí odkaz: http://arxiv.org/abs/2406.17332

The TESS-Keck Survey. XXII. A sub-Neptune Orbiting TOI-1437

Autor: Pidhorodetska, Daria, Gilbert, Emily A., Kane, Stephen R., Barclay, Thomas, Polanski, Alex S., Hill, Michelle L., Stassun, Keivan G., Giacalone, Steven, Ciardi, David R., Boyle, Andrew W., Howell, Steve B., Lillo-Box, Jorge, MacDougall, Mason G., Fetherolf, Tara, Batalha, Natalie M., Crossfield, Ian J. M., Dressing, Courtney, Fulton, Benjamin, Howard, Andrew W., Huber, Daniel, Isaacson, Howard, Petigura, Erik A., Robertson, Paul, Weiss, Lauren M., Angelo, Isabel, Beard, Corey, Behmard, Aida, Blunt, Sarah, Brinkman, Casey L., Chontos, Ashley, Dai, Fei, Dalba, Paul A., Holcomb, Rae, Lubin, Jack, Mayo, Andrew W., Murphy, Joseph M. Akana, Rice, Malena, Rubenzahl, Ryan, Scarsdale, Nicholas, Turtelboom, Emma V., Tyler, Dakotah, Van Zandt, Judah, Schwieterman, Edward W.

Exoplanet discoveries have revealed a dramatic diversity of planet sizes across a vast array of orbital architectures. Sub-Neptunes are of particular interest; due to their absence in our own solar system, we rely on demographics of exoplanets to bet

Externí odkaz: http://arxiv.org/abs/2405.12448