This system was observed for a dust disc or comet belt in 2009 by theSpitzer Space Telescope; a belt was inferred at 102 AU.[9] It has an inclination of 48°.[10]
The star exhibits a magnetic activity cycle remarkably similar to that of theSun, with a period of 10.8 years.[11]
The exoplanet HD 38858 b was discovered in 2011 in orbit in its host star's habitable zone, a zone in which Earth-like conditions (namely the presence of liquid water) on a planet's surface are possible.[13][14] The planet is likely agas giant, a type of planet whichastronomers believe is unlikely to supportlife as it is currently understood. However, the planet could have arockynatural satellite capable of sustaining an Earth-like environment.[15]
The existence of this planet was disputed since 2015 though, attributing the planetary signal to thefrequency-domain alias of the star magnetic activity cycle, although the existence of another planet on the 198-day orbit is suspected.[11]
^abcJohnson, H. L.; Iriarte, B.; Mitchell, R. I.; Wisniewskj, W. Z. (1966). "UBVRIJKL photometry of the bright stars".Communications of the Lunar and Planetary Laboratory.4 (99): 99.Bibcode:1966CoLPL...4...99J.
^abcFlores, M.; González, J. F.; Jaque Arancibia, M.; Saffe, C.; Buccino, A.; López, F. M.; Ibañez Bustos, R. V.; Miquelarena, P. (2018). "HD 38858: A solar-type star with an activity cycle of ~10.8 yr".Astronomy & Astrophysics.620: A34.arXiv:1809.05581.doi:10.1051/0004-6361/201833330.S2CID126153522.
^Matrà, L.; Marino, S.; Wilner, D. J.; Kennedy, G. M.; Booth, M.; Krivov, A. V.; Williams, J. P.; Hughes, A. M.; Burgo, C. del (2025-01-15). "REsolved ALMA and SMA Observations of Nearby Stars (REASONS): A population of 74 resolved planetesimal belts at millimetre wavelengths".Astronomy and Astrophysics.693.arXiv:2501.09058.Bibcode:2025A&A...693A.151M.doi:10.1051/0004-6361/202451397.
^Wyatt; m sin i is0.0961±0.012 MJ /30.55±4.11 (which Wyatt knew from most current cited paper Mayor, "HARPS XXXIV", 2011). Wyatt has likely factored in the inclination but did not state this outright in the arXiv version of the paper.
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