Gliese 752

This stellar pair form a binary star system separated by about 74 arc seconds (~434 AU).

[5][6] In August 2018, a group of scientists using measurements taken from the CARMENES spectrograph, on the Calar Alto Observatory located in Spain, announced they had detected a planet orbiting the larger of the stars, HD 180617 (Gliese 752 A).

The measurements indicated the presence of a planet with a minimum mass comparable to Neptune on an orbit partly located within the habitable zone.

[11] However a subsequent spectrographic survey failed to confirm the presence of any large planets in orbit around this star.

It had previously been assumed that low mass red dwarfs would have insignificant or nonexistent magnetic fields.

Nevertheless, the detection of solar flares indicates that as yet unknown process allows low mass stars to produce sufficient magnetic fields to power such outbursts, even if solely by convection, without a radiative core.

A visual band light curve for Gliese 752 A, adapted from Weis (1994) [ 13 ]