Revisiting physical parameters of the benchmark brown dwarf LHS 6343 C through a HST/WFC3 secondary eclipse observation

Autor: Frost, William, Albert, Loïc, Doyon, René, Gagné, Jonathan, Montet, Benjamin T., Fontanive, Clémence, Artigau, Étienne, Johnson, John Asher, Edwards, Billy, Benneke, Björn

The LHS 6343 system consists of a resolved M-dwarf binary with an evolved, negligibly irradiated brown dwarf, LHS 6343 C, orbiting the primary star. Such brown dwarf eclipsing binaries present rare and unique opportunities to calibrate sub-stellar ev

Externí odkaz: http://arxiv.org/abs/2408.05173

Thriving in a Pandemic: Lessons Learned from a Resilient University Program Seen Through the CoI Lens

Autor: Ma, Zihui, Li, Lingyao, Johnson, John C. E.

In March 2020, college campuses underwent a sudden transformation to online learning due to the COVID-19 outbreak. To understand the impact of COVID-19 on students' expectations, this study conducted a three-year survey from ten core courses within t

Externí odkaz: http://arxiv.org/abs/2310.20183

A non-associative incidence near-ring with a generalized M\'obius function

Autor: Johnson, John, Wakefield, Max

There is a convolution product on 3-variable partial flag functions of a locally finite poset that produces a generalized M\"obius function. Under the product this generalized M\"obius function is a one sided inverse of the zeta function and satisfie

Externí odkaz: http://arxiv.org/abs/2204.07158

The HD 217107 Planetary System: Twenty Years of Radial Velocity Measurements

Autor: Giovinazzi, Mark R., Blake, Cullen H., Eastman, Jason D., Wright, Jason, McCrady, Nate, Wittenmyer, Rob, Johnson, John A., Plavchan, Peter, Sliski, David H., Wilson, Maurice L., Johnson, Samson A., Horner, Jonathan, Kane, Stephen R., Houghton, Audrey, García-Mejía, Juliana, Glaser, Joseph P.

The hot Jupiter HD 217107 b was one of the first exoplanets detected using the radial velocity (RV) method, originally reported in the literature in 1999. Today, precise RV measurements of this system span more than 20 years, and there is clear evide

Externí odkaz: http://arxiv.org/abs/2009.12356

A pair of TESS planets spanning the radius valley around the nearby mid-M dwarf LTT 3780

Autor: Cloutier, Ryan, Eastman, Jason D., Rodriguez, Joseph E., Astudillo-Defru, Nicola, Bonfils, Xavier, Mortier, Annelies, Watson, Christopher A., Stalport, Manu, Pinamonti, Matteo, Lienhard, Florian, Harutyunyan, Avet, Damasso, Mario, Latham, David W., Collins, Karen A., Massey, Robert, Irwin, Jonathan, Winters, Jennifer G., Charbonneau, David, Ziegler, Carl, Matthews, Elisabeth, Crossfield, Ian J. M., Kreidberg, Laura, Quinn, Samuel N., Ricker, George, Vanderspek, Roland, Seager, Sara, Winn, Joshua, Jenkins, Jon M., Vezie, Michael, Udry, Stéphane, Twicken, Joseph D., Tenenbaum, Peter, Sozzetti, Alessandro, Ségransan, Damien, Schlieder, Joshua E., Sasselov, Dimitar, Santos, Nuno C., Rice, Ken, Rackham, Benjamin V., Poretti, Ennio, Piotto, Giampaolo, Phillips, David, Pepe, Francesco, Molinari, Emilio, Mignon, Lucile, Micela, Giuseppina, Melo, Claudio, de Medeiros, José R., Mayor, Michel, Matson, Rachel, Fiorenzano, Aldo F. Martinez, Mann, Andrew W., Magazzú, Antonio, Lovis, Christophe, López-Morales, Mercedes, Lopez, Eric, Lissauer, Jack J., Lépine, Sébastien, Law, Nicholas, Kielkopf, John F., Johnson, John A., Jensen, Eric L. N., Howell, Steve B., Gonzales, Erica, Ghedina, Adriano, Forveille, Thierry, Figueira, Pedro, Dumusque, Xavier, Dressing, Courtney D., Doyon, René, Díaz, Rodrigo F., Di Fabrizio, Luca, Delfosse, Xavier, Cosentino, Rosario, Conti, Dennis M., Collins, Kevin I., Cameron, Andrew Collier, Ciardi, David, Caldwell, Douglas A., Burke, Christopher, Buchhave, Lars, Briceño, César, Boyd, Patricia, Bouchy, François, Beichman, Charles, Artigau, Étienne, Almenara, Jose M.

We present the confirmation of two new planets transiting the nearby mid-M dwarf LTT 3780 (TIC 36724087, TOI-732, $V=13.07$, $K_s=8.204$, $R_s$=0.374 R$_{\odot}$, $M_s$=0.401 M$_{\odot}$, d=22 pc). The two planet candidates are identified in a single

Externí odkaz: http://arxiv.org/abs/2003.01136