Zobrazeno 1 - 10
of 325
pro vyhledávání: '"Barnes, J. R."'
Discovering exoplanets orbiting young Suns can provide insight into the formation and early evolution of our own solar system, but the extreme magnetic activity of young stars obfuscates exoplanet detection. Here we monitor the long-term magnetic fie
Externí odkaz:
http://arxiv.org/abs/2401.12408
Autor:
Barnes, J. R., Standing, M. R., Haswell, C. A., Staab, D., Doherty, J. P. J., Waller-Bridge, M., Fossati, L., Soto, M., Anglada-Escudé, G., Llama, J., McCune, C., Lewis, F. W.
We present radial velocity measurements of the very bright ($V\sim5.7$) nearby F star, DMPP-4 (HD 184960). The anomalously low Ca II H&K emission suggests mass loss from planets orbiting a low activity host star. Periodic radial velocity variability
Externí odkaz:
http://arxiv.org/abs/2307.07530
Autor:
Perger, M., Anglada-Escudé, G., Baroch, D., Lafarga, M., Ribas, I., Morales, J. C., Herrero, E., Amado, P. J., Barnes, J. R., Caballero, J. A., Jeffers, S. V., Quirrenbach, A., Reiners, A.
Publikováno v:
A&A 672, A118 (2023)
Precision radial velocity (RV) measurements continue to be a key tool to detect and characterise extrasolar planets. While instrumental precision keeps improving, stellar activity remains a barrier to obtain reliable measurements below 1-2 m/s accura
Externí odkaz:
http://arxiv.org/abs/2301.12872
Autor:
Gorrini, P., Astudillo-Defru, N., Dreizler, S., Damasso, M., Díaz, R. F., Bonfils, X., Jeffers, S. V., Barnes, J. R., Del Sordo, F., Almenara, J. -M., Artigau, E., Bouchy, F., Charbonneau, D., Delfosse, X., Doyon, R., Figueira, P., Forveille, T., Haswell, C. A., López-González, M. J., Melo, C., Mennickent, R. E., Gaisné, G., Morales, N., Murgas, F., Pepe, F., Rodríguez, E., Santos, N. C., Tal-Or, L., Tsapras, Y., Udry, S.
Publikováno v:
A&A 664, A64 (2022)
Context. Gliese 832 (GJ 832) is an M2V star hosting a massive planet on a decade-long orbit, GJ 832b, discovered by radial velocity (RV). Later, a super Earth or mini-Neptune orbiting within the stellar habitable zone was reported (GJ 832c). The rece
Externí odkaz:
http://arxiv.org/abs/2206.07552
Autor:
Jeffers, S. V., Barnes, J. R., Scheofer, P., Quirrenbach, A., Zechmeister, M., Amado, P. J., Caballero, J. A., Fernandez, M., Rodriguez, E., Ribas, I., Reiners, A., Guillen, C. Cardona, Cifuentes, C., Czesla, S., Hatzes, A. P., Kurster, M., Montes, D., Morales, J. C., Pedraz, S., Sadegi, S.
Publikováno v:
A&A 663, A27 (2022)
Current exoplanet surveys using the radial velocity (RV) technique are targeting M dwarfs because any habitable zone terrestrial-mass planets will induce a high RV and orbit on shorter periods than for more massive stars. One of the main caveats is t
Externí odkaz:
http://arxiv.org/abs/2203.00415
Autor:
Jeffers, S. V., Dreizler, S., Barnes, J. R., Haswell, C. A., Nelson, R. P., Rodríguez, E., Lopez-Gonzalez, M. J., Morales, N., Luque, R., Zechmeister, M., Vogt, S. S., Jenkins, J. S., Palle, E., Berdinas, Z. M., Coleman, G. A. L., Diaz, M. R., Ribas, I., Jones, H. R. A., Butler, R. P., Tinney, C. G., Bailey, J., Carter, B. D., O'Toole, S., Wittenmyer, R. A., Crane, J. D., Feng, F., Shectman, S. A., Teske, J., Reiners, A., Amado, P. J., Anglada-Escude, G.
The nearest exoplanets to the Sun are our best possibilities for detailed characterization. We report the discovery of a compact multi-planet system of super-Earths orbiting the nearby red dwarf GJ 887, using radial velocity measurements. The planets
Externí odkaz:
http://arxiv.org/abs/2006.16372
Autor:
Xiang, Yue, Gu, Shenghong, Cameron, A. Collier, Barnes, J. R., Christensen-Dalsgaard, J., Grundahl, F., Antoci, V., Andersen, M. F., Pallé, P. L.
We present new Doppler images of both components of the double-lined binary $\sigma^{2}$ CrB, based on the high-resolution spectroscopic data collected during 11 nights in 2015 March--April. The observed spectra form two independent data sets with su
Externí odkaz:
http://arxiv.org/abs/2005.02592
Autor:
Stock, S., Kemmer, J., Reffert, S., Trifonov, T., Kaminski, A., Dreizler, S., Quirrenbach, A., Caballero, J. A., Reiners, A., Jeffers, S. V., Anglada-Escudé, G., Ribas, I., Amado, P. J., Barrado, D., Barnes, J. R., Bauer, F. F., Berdiñas, Z. M., Béjar, V. J. S., Coleman, G. A. L., Cortés-Contreras, M., Díez-Alonso, E., Domínguez-Fernández, A. J., Espinoza, N., Haswell, C. A., Hatzes, A., Henning, T., Jenkins, J. S., Jones, H. R. A., Kossakowski, D., Kürster, M., Lafarga, M., Lee, M. H., González, M. J. López, Montes, D., Morales, J. C., Morales, N., Pallé, E., Pedraz, S., guez, E. Rodrí, Rodríguez-López, C., Zechmeister, M.
Publikováno v:
A&A 636, A119 (2020)
The nearby ultra-compact multiplanetary system YZ Ceti consists of at least three planets. The orbital period of each planet is the subject of discussion in the literature due to strong aliasing in the radial velocity data. The stellar activity of th
Externí odkaz:
http://arxiv.org/abs/2002.01772
Autor:
Xiang, Yue, Gu, Shenghong, Wolter, U., Schmitt, J. H. M. M., Cameron, A. Collier, Barnes, J. R., Mittag, M., Perdelwitz, V., Kohl, S.
We present the first Doppler images of the prototypical active binary star RS CVn, derived from high-resolution spectra observed in 2004, 2016 and 2017, using three different telescopes and observing sites. We apply the least-squares deconvolution te
Externí odkaz:
http://arxiv.org/abs/2001.02572
Autor:
Staab, D., Haswell, C. A., Barnes, J. R., Anglada-Escudé, G., Fossati, L., Doherty, J. P. J., Cooper, J., Jenkins, J. S., Díaz, M. R., Soto, M. G.
The Dispersed Matter Planet Project targets stars with anomalously low Ca II H&K chromospheric emission. High precision, high cadence radial velocity measurements of the F8V star HD 38677 / DMPP-1 reveal four short period planets. DMPP-1 has log(R'HK
Externí odkaz:
http://arxiv.org/abs/1912.10792