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We report on the first polarimetric study of (3200) Phaethon, the target ofJAXA's DESTINY$^+$ mission, in the negative branch to ensure its anhydrousnature and to derive an accurate geometric albedo. We conducted observations atlow phase angles (Sun-target-observer angle, alpha = 8.8-32.4 deg) from 2021October to 2022 January and found that Phaethon has a minimum polarizationdegree $P_{min}$ = -1.3 +- 0.1 %, a polarimetric slope h = 0.22 +- 0.02 %deg$^{-1}$, and an inversion angle alpha$_0$ = 19.9 +- 0.3 deg. The derivedgeometric albedo is $p_V$ = 0.11 (in the range of 0.08-0.13). Thesepolarimetric properties are consistent with anhydrous chondrites, andcontradict hydrous chondrites and typical cometary nuclei.

(3200) Phaethon Polarimetry in the Negative Branch: New Evidence for the Anhydrous Nature of the DESTINY+ Target Asteroid